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Last updated on
January 11, 2003
Visitors since 7/28/2002
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![]() Rob's Aquatic Illusion PageHelping people to enjoy their fresh water aquariums through makeovers. Tired of your drab 'river bottom' style fresh water aquarium? Then read on! This page will help the fresh water aquariust to immitate a salt water tank. The number one benefit of creating this aquatic illusion is cost and care efficency. Freshwater fish and tanks are often cheaper and easier to maintain than salt water tanks. In many locations around the nation salt water supplies are extremly overpriced or non existant at all. Combine these elements together and you have a strong reason to create this specific aquatic illusion. I am here to help.
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The ability to immitate a salt water environment with a fresh water aquarium is limited in quite a few ways.
Before we go any further you should realize that there are 3 kinds of fish tanks. You already know that there are fresh salt water aquaria but did you know about the third?
Brack-Water fish tanks are best described as 'half-fresh half-salt' water fish tanks. These tanks can sometimes be difficult to maintain, but compared to normal salt water fish tanks they are much easier. There are several factors that make brack tanks a curious note. For one they auctually have a salt content that tends to make the water appear clearer. Second some of the brack-only fish look verry much like salt water fish. These fish require a brack water condition to survive. Most often they can not adjust to a full freshwater condition. An added pluss is that they can survive the addition of crush coral gravel. (to be descibed below)
The number one thing that ANY fresh water aquariust should concentrate on is the happyness of their fishes. This most often results in createing a 'river bed' environment. This 'river bed/lake bed' style tank usually is called a 'natural' tank with brown gravel, lots of fake/live plants and lots of places for bottom feeding and top dwelling fish.
In no way shape or form should you EVER apply information about salt water tanks to try to 'help' this illusion. DO NOT use salt water specific chemicals, products, or 'charts' in an attempt to further this illusion. Also make it clear to anyone attending this tank that it is a freshwater tank and NOT a saltwater tank. This confusion could cost you lots of money and time in fish and care.
Now before you go out and buy coral gravel or fake coral for this immitation tank read on! PLEASE!. There are many "Dos & Dont's" of tank immitation. Some of these can cost you the verry life of your fish.
Here you will learn some of the major diferences between salt fesh water aquaria. This section is geared to the fresh water aquariust and will not go into deep topic about salt water fish tank care. In this section you will find the answers to some of the major problems in illusion aquaria. To keep it simple to understand the information has been broken down into easy to understand peices.
Salt water tank are notoriously famous for their crystal clear water and brilliant fish. This clarity is caused by the salt content in the water. A salt content so high it would kill most freshwater and brack water fish.
Many home aquariust that own freshwater tanks dread this topic. They often complain of how their tanks seem cloudy or dirty. This is often due to inadequet filtration or water changes. There are a few chemicals that can help in this category, but only if the above two problems are fixed fist.
A proper filter goes a long way. Did you know that the 'maximum' size a tank that most store bought filters are rated to filter won't do the job for many aquariums. That's because most manufactureres support the growth of live plants in an aquarium. Having both kept aquariums and now working in a fish store I know a large majority of aquariust do not keep live plants. This means that the maximum tank size that a filter can handle, acording to the manufactuer, is based on a heavily planted tank with a few fish. Since our immitation tank will not have live plants you NEED a much better filter.
My personal rule of thumb is to take the number of gallons the tank holds in water, and multiple this number by ten. Your hang on the back filter should filter this end number gallons per hour for proper filtration. For example. a 10 gallon tank should have a filter that filters up to 100 gallons per hour.
Preffered canister filter: Eheim ProII
Preffered hang-on-the-tank filter: Aquaclear
Water changes are a necesity. changing 1/3 of the tanks volume per month goes a long way to keep amonia levels down and nitrates under control. (amonia is produced by fish poo and is poisonous to fish, and nitrates act as fertilizer for that annoying green algae)
You should also 'gravel clean' the tank when you do this water change. Mainly because most gravel cleaners use a siphon method to do this.
Advised gravel cleaning product: Python
There are two kinds of cloudyness found in a fish tank. These cloudness can be attended to with the use of a few chemicals. The first is particulate cloudyness. This is that fine floating dust that is stirred up with silt and when the bottom gravel is disturbed. There are a lot fish-safe chemicals out there to handle this. The second is milky cloudyness. This is a cloudyness that is a filmy haze with no dust or particles in it. It is often a symptom of 'new tank syndrome'. Or when you change too much water in a tank, 1/2 or more. There are considerably fewer chemicals that can handle this. Most often if you wait about a week or two it goes away naturally by itself. Useing the particulate chemicals on a lightweight basis, every week 1/2 or 2 can help keep down dust and promote a verry clear tank water.
Advised chemical for Particulate cloudyness: Crystal Clear
Advised chemical for milky cloudness: B-Clear
If you have ever see a saltwater tank you will instant recognize two telltale signs. The first is the crush coral gravel, a verry bright white gravel that almost glows. The second is the pitch black background on the back of the tank.
In addition to the background and gravel the unseen element is it's lighting. Lighting for saltwater tanks is intense. So intense that the white gravel seems to glow. Most lights provided with aquaria hoods are rated around 4 to 5 'K'. Which in a dark room seems bright, but in daytime it looks quite dim. I would suggest replaceing the light with a 10k bulb. This isn't as intense as the high 20k bulbs used in salt water tanks and is probably safer for the fish.
The backdrop is an easy thing to handle. It goes outside the tank and does little to the tank care itself. Saltwater tanks use a black backdrop to help give the fish a sense of safety. The reason is that a large proportion of saltwater fish hang around the bottom of the sea floor, which is either a secure rocky terrain with lots of hiding holes, or wide and open. In either case the black backdrop ensure a feeling of safety in saltwater fish. It does the same thing for freshwater fish as well.
In selling plastic 'tape-on' backgrounds I have noticed a bad trend. The edge of the tank stands about 1/2 a centimeter away from the glass of the tank. People often measure the plastic background to the edging, then try to tape it to edging. This sucks it away from the tank and looks fake. So they tape it closer to the tank. Eventually this 'peeling' effect occurs and the edging ends up with layers of old tape glue stuck on the back. The solution is to cut the background to sit flat on the back of the tank glass, just under the top edging and just above the bottom edging; also just a little in from each of the tanks glass corners. When taped on the tape doesnt act to keep it flat (as noted above)because it doesnt have those pull away problems. Instead it's really holding it 'up' on the tank and from falling away.
Salt water tanks require a high ph. A ph so high that most of the water in the country is below that. To prevent this high ph from dropping they add crushed coral gravel to the tank. When the coral disolves slowly it makes the water 'hard'. which helps to prevent the ph from changeing. either up or down. In a freshwater tank this crushed coral (which is often imbuned with sea salt) Will not only make the water salty, but will raise your ph. Most freshwater fish preffer much lower ph levels. To make matters worse not only would it raise the ph, but make the water hard, and prevent it from ever comeing back to a safe range untill you remove the crushed coral.
The only thing you can do to immitate this crushed-coral-gravel is to use a naturally white 'gravel'. Or possibly the painted white gravel. The problem with painted white gravel is that over time the paint will wear off making it appear dull or even the color of the true stone beneath the paint. So the best is to get a verry natural white stone with a small pebble size.
Fine sand, even the kinds that are 'safe' for freshwater use are horendous in a freshwater tank. Over time they slowly turn tan from absorbing other minerals in the water. Fish poo gets mixed in and you cant get it out. you CANT gravel clean sand. Its so fine that the sipon based gravel cleaners will suck it out in addition to the silt. Even if you can advoid these things, over time sand with compact into a kind of 'sandstone' that you cant shift. Eventually you'll have to break it out of the tank just to get it out. Besides you can't use it with an undergravel filter. (option for later use)
In salt water aquaria you will notice the abundant use of what appears to be craggy 'stone trees'. These are called coral, but the truth is that they are the skeletal remains of coral. In other words, dead coral. There are sometimes rocks that seem to have this coral stuck to them or even growing into them. This is sometimes called 'reef rock'.
These dead coral's are a keynote decoration in most saltwater aquaria. Without them it is verry difficult to recognize the tank as a saltwater one. There is one verry important thing about them..
As described above, (white gravel black backdrops) dead coral will make the water salty, raise ph, and basicly make a fresh water fish tank inhospitable for its occupants.The positive note is that there is an abundant of fake coral on the market today. With the world's reefs becoming smaller with each day, and laws protecting them; real dead coral is becoming increasingly expensive. So expensive that even high quality fake coral (which looks about as good as the real thing) is considerably cheaper. Fake coral is also necessary for a fresh water -salt immitation- tank. It's safe for the fish and bueatiful as well. I'll desribe their use later.
Ever seen those walls of rocks in a salt water fish tank. That pink stuff on them is auctually alive. (its a form of algae) You may even see things that look like sea anonomies on them. Those are auctually 'live coral'. Many times 'reef aquarist' will use regular craggy stone to fill the gaps between live rock. As time passes creatures from the live rock should grow, possible propogate and move to the regular stone, essentially makeing it into live rock.
You can however use that craggy stone to imitate live rock. The best stone I have ever found to do this job is called "Lace Rock". Its a craggy gray rock that blends in perfectly with live rock. Now you could Immitate that pink 'coraline algae'. I do not have the process doccumented as I have never done it. I presume the process would involve some form of fish safe paint. What that would be I have no idea. I do not suggest you to do it unless you have a professional to advise you.
Salt water plants are impossible to grow in a fresh water environment. With recent advances in fake decorations there are now a large variety of fake salt water plants available.
Advised fake plants: Seagarden Marine Series
Since creating this illusion is an art you must understand that any part of this illusion that does not serve any function in filtering your tank or keeping the fish happy, is mere decoration. These may include the telltale signs of salt water filters, elements, and and other devices that only work in a salt water tank. All of them, decoration
Salt water tanks are notorious for several visible filter signs.
Before modern filtration, undergravel filters was a mainstay in smaller (40 gallons and under) fish-only salt water aquaria. Even then, using some kind of back filter was still adviseable. The reason is simple. Biology plays an important part in both fresh water and salt water aquaria. Cultivating benefical bacteria to ensure proper water conditions is a must. Even more so with a salt water tank. Under gravel filters were still are a primary means of cultivateing that bacteria culture. Salt water 'reef' tanks NEVER use undergravel filters. The rock walls crushes the plates and small creatures cand burrow down into the gravel and become harmed or traped by the holes or water flow. Therefore only use a undergravel filter (wether as decoration or as auctual use) to fake fish-only salt water tanks. Cleaning note: Because undergravel filters tend to draw dirt to the bottom of the tank, the need to gravel clean the tank on a monthly basis becomes VERRY IMPORTANT. Without a monthly gravel cleaning the undergravel filters can begin to fail and result in increasingly worse water conditions.
Preffered Brand: Plen Plax
Since almost no one uses undergravel filters these days, im not sure why you would want to do this. But its verry simple. Many fish stores sell the air lift tubes and their tops. Simply use aquarium sealant to seal a tube to a peice of slate or other flat stone (to get it to stay down and even) and place them to the back of the tank. (with apropiate air stones of course). You would NOT want to fake it with a 'power head'. Though you could possibly put a strainer on the bottom so it would suck water up from the bottom of the tank and help circulate water in tall tanks.
In many 'Reef' style salt water aquaria you can find overflow boxes. These boxes go from the bottom of the tank up to the top of the water line. There water flows into these boxes through groves at the top. When you can see the back or side of the tank, you can see that the water level in the boxes are lower as the water flows from the tank, down into them. This is because the overflow box is the 'intake strainer' for a larger filter outside of the tank. Many times this filter is hidden either underneath or behind the tank and takes the water in through a hole drilled into the glass at the bottom of the overflow box section of the aquarium. NEVER attempt to drill a hole into an aquarium. To do so weakens your fish tank. Most fish tanks have tempered glass bottoms. This means the moment you DO cut the glass on the bottom the entire bottom of the tank would fracture like the windsheild of a car. The differnece is that car's have a 'safety plastic' layer to keep the glass from flying into the passengers eyes. Fish tanks do not have these. Even if you did succede there would be so much stress on the fish tank that the bottom of the tank could STILL crack just from it having been weakened just a little bit.
You can create a simple fake overflow box for your 'reef' faker aquarium verry easily. Simply take two peices of acrylic plastic (prefferab
ly black) of equal width and proper height. Cut the 'drain slots' into the top and at the bottom you can have fun. You can cut long thin slots, or lots of small holes. Prefferably above the gravel level. This allows water to flow through this false box. you could even use this box to isolate a sick fish, or perhaps house a much needed airstone. (where ever air stones are, algae will grow quickly. having the airstone in the false box makes cleaning up this algae verry easy)
Air stones, and thermometers are much the same between the two styles of tanks. Never use a wooden airstone in a fresh water tank. And try to advoid funky color airstones. Most salt water aquariust want their tanks to look nice and neat. Often bright neon colors don't tend to fit into their idea of what nice and neat are. -Heaters When salt water evaporates it leaves behind a residue that corrodes electronics. Heaters that hang on the back of the tank with the control above water level have a bad reputation. This is because humidity will sooner or later creep its way into the electronics and kill them. Thus all salt water tanks use submersible heaters.
Salt water fish tend to be a bit agressive and even if they aren't, NEED more space to swim in than their freshwater counterparts. Their agressiveness means that they are territorial and often do not do well with others of their own kind, or even other types of fish. This tends to result in a tank with only a few select fish and a LOT of open swimming space. There is also the fact that salt water fish tend to NEED more space to swim in than fresh water fish do. This also supports the concept of having only a few fish in a single tank. Though they tend to be territoral they do need their 'private space'. Like grouchy old men they need their own little bedrooms to feel safe in. Dead coral decorations tend to create these divions between water areas. combining them with lace rock to immitate reef rock also helps out. There are many 'wall of rock' style tanks that are made for the smaller fish so they can hide in amoung all the little nooks and crannies and feel safe. It's advised that if you have fake coral in a tank with these fake reef rocks that to have the coral sticking out from the rock as if it were a tree growing from a hill. As if to immitate nature in using shen-fui.
Ever seen a salt tank with tons of sea annonmies and a wall of rock. Well the truth is that most of those anonmies are really live coral. Yes, a good amount of live coral leave no skeletons behind. These tanks are geared toward the propogation of these corals. They often have no fish in them at all. The 'wall' is created so as to maximize the amount of surface area in which the corals can live. Like trees they need plenty of light. So its like terraceing a garden. In our case we wouldn't have to worry about the lighting or plants. Most likely we would choose small fish so they can hide amoung the rocks in harmony.
That wall of rocks.. Well, its not really a -solid- wall of rocks. Closer inspection will reveal that there is a system of shelves behind the rocks. All of which is cleverly hidden by lace or reef rock. The reason they have this is simple. Reef rock 'aka live rock' has dozens of beneficial bacteria on them. To take full effect of this bacteria you have to have a good strong flow of water COMPLETELY around the reef rock. To acomplish this they put the reef rock on stands made of pvc piping and a grid often called 'egg crate'. This allows the critters that need special lighting to be closer to the light, and the water to flow all around the rock. It also creates lots of little dens and hollows for tiny fish and critters to hide in and about. Please contact your local fish store, or a refference on building reef aquaria about the use of plumbing piping as a reef shelf material. That pvc piping is cold, plain white, low pressure tubing. The hot, colored or high pressure tubing leaches out chemicals. These chemicals can KILL your fish. That 'eggcrate' I spoke of is a kind of grating often used for drop ceiling lighting. It too is plain white. The use of this shelving is HIGHLY endorsed. the reason is that the tremendous weight of the rocks (fresh or salt water) can be a high strain on the bottom of your fish tank. Even moreso on the sides of the tank itself. A worse case scenario could have a heavy rock wall fall down and against the side of the tank, breaking the glass. What a disaster that would be. Some people use a aquarium-safe epoxy resign and glue their rocks together. That way they dont need shelving but they have to choose their rocks carefully, and assemble them so they have good support and strength. It's advised NOT to glue the rocks to the glass and to remember that when assembled you should also have the ability to take them out of the aquarium easily!
Algae is a constant problem with fresh water aquaria. Fortunately there are many chemical products that can zap those fears away. However salt water folks don't have as much luck. For them contending with algae is more of a biological war than a chemical one. They most often desire the use of natural algae eating fish, snails, or other small invertibrates. Unfortunatley there are similar algaes between both types of tanks. Even worse Algae will catch on anything in a freshwater tank and spread like wildfire. This will quickly destroy the illusion of a salt water tank. So its the hidden enemy you must take care of at all times!
Green algae that starts as a slimy coating then grows into strings is evident in both types of tanks. It's a sign of a well cared tank, but a bit over oxygenated. (ie too much air) It's grows extremly well in freshwater tanks. Advoid mass amounts of this algae. Some here and there on rocks helps, but overall, advoid it.
Green algae that starts as slime and STAYS slime is the scourage of freshwater fish tanks. It coats everything, is messy to clean up, and is hard to get rid of. This is the algae that most freshwater tanks gets. Advoid it if possible.
In saltwater tanks 'red algae' is the scourage of the tank. It will kill the extremely expensive live rock in a heartbeat. Its grows as fast kudzu and is just as hard to get rid of. In freshwater tanks its sign of VERRY BAD maintenance and care. In both cases seek a higher level of maintenance or water care to advoid this type of algae.
Algae will grow heavily around an airstone. This means wherever you have an airstone, or bubble wall' algae will grow in abundance. Anywhere you have an airstone beneath a rock or fake coral. Algae will grow in abundance on that rock or fake coral. You might want to consider the above mentioned 'fake corner box' just so you can keep the algae growing area contained.
None of the freshwater plants out there will safely simulate saltwater plants. Even in highly maintained saltwater setups, plants have a tendency die quickly. So I would just skip the use of them all together.
The 'salt water illusion' style tanks are always frought with several main problems. The first is algae, it always attacks constantly. The second is the lack of fish that look exotic enough to seem like salt water fish. The Third is dirt. Dirt algae often grow in abundance and the gravel becomes discolored verry quickly.
Salt water illusion tanks are UNADVISEABLE. The gravel becomes discolored verry quickly. Algae will always peek out from the edges making the tank seem dirty or unsightly. If money is no option you could do this. However it would need to be atended VERRY often.
Medium tanks are VERRY GOOD for illusion tanks. However this should only be for the experienced aquariust. The care illusion for this size tank should be high. Not as high as needed for large tanks but almost as much.
This is the BEST size tank to do this aquatic illusion. They are easy to care for and you can find a larger variety of brilliant collored fish. Also fake coral is much cheaper when you purcahse it for this size tank.
There are two primary classes of fish you can keep.
Ciclids ofen grow anywhere from 6 inches and up. Most often becoming more dull as they become larger. Some that stay as small as 6 inches tend to keep more of that brilliant color. Brackwater fish include mollies, but also include the more exotic fish that are idea for these aquatic illusion. These fish ARE more difficult to keep than regular freshwater fish. This is due to the fact that they need special chemicals to keep them happy. Prime examples of these fish are...
Mono - a fish that doesnt seem to have those spiney fins sticking out of the back. its thin and smoothe. though grey and silvery they are verry pretty.
Scats - are similar in nature. These guys have scales that almost blend together making them seem more like a salt water fish than a freshwater fish. Their colors are muted, greens Blacks, but they are quite exotic.
These fish are the ones you usually find in your standard community fish tank. Most of the fish get along with one another just fine, with a few exceptions of course. The MAJOR DRAWBACK IS SIZE. Most of these brilliantly colored fish are small. (under 3 to 4 inches for grown adults) The end result is you can do one of two things when it comes to your faker tank.
A: Keep a small tank with a few select fish
This proides the illusion of a special tank for just those few fish. Just like saltwater tanks often seperate differnt species. You can also ignore scale differences as well and concentrate on happy fish. Useing a 'fake reef wall' allows you to keep many small fish types and give them a happy place to swim in and between all those neato rocks and passages. Don't forget, just because they are freshwater fish in a faker tank, they sitll need their naturall necessities. Use the area under the upper rock shelves as a place to put/hide things necessary for your specific freshwater fish. Like hidey holes for ghost knives, and fake plants for those that preffer to hide in them rather than rocks. all hidden from view of course but available for the fishies.
B: Keep a medium to small tank but 'scale' everything down.
This is a total illusion of a minature saltwater fish tank. It scales everything down as if in minature. This will create several unique situations. The lower tank ensures that the high intensity/color enhanceing light will reach the bottom of the tank. This ensures a brilliant contrast and color enhancement for the fishies. It also keeps spending on this faker tank to a minimum. Care is also cut down as there is less to mes around with. you can also concentrate on the illusion more than you could with the larger tanks. Small things like corner boxes, pvc shelves output water hoses that may be decoration but help complete the all around illusion.
Large "scale" fish There are many fish that have scales so small you cant see them that clearly. These small scale fish are the best type to choose. The reason is ismple. In many marine species of fish you cant really notice the size of each scale on the fish. the coloring is so blended together in the scales of a saltwater fish that you often cant make out the individual scales. It almost appears as if a scale-less fish. Blatantly freshwater fish By this i mean goldfish. Though bueatiful the above rule is PRIMARY in chooseing faker fish. Goldfish are messy, and too common for a faker tank. Plecostomas are another one you want to advoid. Though some striped and special colored ones might be a nice choice.
Brilliant colors Many freshwater fish will appear as though bueaty queens with the special lighting and B W backdrop. Unfortunately many fish stores will use the gravel that people wont buy. Usually the neon color gravel. And most often they use a pale blue backdrop behind the tank. An average backdrop neither white or black. Both of these will make any colorful fish appear pale or dull. Below is my special list of fish that are perfect for Faker tanks.
This is a list of fish that are IDEAL to use for these 'fake salt water' tanks.
| Beta | Large fins strong colors, but only one per tank. |
|---|---|
| Red fantail molly's | Red becomes brilliant in the lighting simple easy fish |
| Fancy fantail guppy | Lots of fin, pritty colors, easy to keep. Choose ones with more solid colors. Too many dul/black ones out there. |
| Neon tetra | Brilliant blue fish the neon is natural unlike painted glass fish. Unfortunately it is a delicate fish that dies easily. |
| Zebra Danio | B W striped fish. A strong starter fish. Dashes about a lot. |
| Paradise fish | The closest thing to a mini discus, scales small, but noticeable. |
| Dwarf Gourami | Similar color to a paradise fish. Some are yellow/blue. Be sure not to get a regular gourami as they get rather large. |
| Tiger barb/ tiger loach | Similar to 'clown fish' in marine tanks. But tiger barbs have definate visible scales. These guys can get up to 4 inches easily. |
| Knife/ghost fish | good for med/large fakers. somewhat exotic. |
| glass fish | sometimes painted, for a touch of the 'weird' exotic. The neon painted wears off in a year. |
| Cherry tetra | Imagine red neon tetra |
| Mini fidler crab | Good for an extra touch but WARNING!They tend to escape from the tank, crawling out on airhose lines, etc. Make sure you have an 'escape proof' tank before doing so. Even escape proof the back of tank filter. They can crawl 'upstream' into the filter and escape from the top. |
| Tiger stripe khuli loach | These little 3/4 inch worm like fish look like eels. Unlike the tiger loach which can grow up to 11" this guy stays small. |
| Puffer fish | A brackwater fish that looks definately exotic and marine-ish. No spikes when it puffs up but definately unique looking. These fish are EXTREMELY agressive. You can only keep them with other puffers. |
| Bumblebee gobi | A tiny B yellow/brown fish somewhat resembeling a clown loach |
| Zebra Plecostoma | Unlike normal brown plecostomas this one is a stunning white fish with thick bold black bands that rezemble zebra stripes. Verry stunning. |
| Gibbiceps Plecostoma | The best way to describe this is a plecostoma with maximim finage to resemble something of a bottom feeding 'lion fish' |
| Ciclids: (varous) | Brnatus, Lemon (which is in yellow or blue varieties), lombardoi, chilumba (blue), johanni (blue) |