10-22-2007, 11:58 PM
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For starters, thats actually a lot of fish for such a small tank. Anything more than 2 of those fish would be considered an overload, and it is beginning to show in the water quality already.
Calcium is very important to check in saltwater. All of the animals need a specific level of it in the water in order for their bodies to function properly. If your LFS does water testing this should be a common test for them to do for you... if not, I would suggest getting yourself a calcium test kit asap.
If you need help finding a reliable kit, let us know and we can guide you from here as much as possible. The only "good" one that I'm aware of is put out by Sera... and is rather easy to perform if you can count drops accurately. the color changes are quite specific, also.
There are a lot of things that could be causing your clown to stop eating. One could be the ammonia level, one could be the elevated nitrate level, one could be calcium related, one could be from stress from any or all of the above. At this point I would say you'd want to begin doing small water changes, about 2 gallons each day. It will be important to bring down that nitrate level and ammonia level asap but without harming the animals.
It is quite possible that one or even all of your fish has gone through some kind of growth spurt, however small... but in a nano tank it will have a harsher effect much faster. The first thing I'd suggest is relocating 1 of those fish or getting into a slightly bigger tank (25 - 30 gallons would support all 3 fish). A royal gramma will average about 3 - 4 inches full grown, and for the ocellaris clowns the female can reach 5 inches, and the male about 3. If there are other animals in the tank such as inverts... crabs, shrimp, corals, anemone, etc... that is more waste level in the tank too. A 12 gallon tank just can't handle that. When fish don't feel well, one of the first signs is that they stop eating and then activity level tends to slow down/change. The water changes will help for a temporary fix and to get them healthy again, but ultimately, either 1 has to go or the tank has to get bigger.
What kind of filter are you running? What media is in it? What foods are you offering? How often are you feeding? How much at a time? How much live rock is in the tank? What are you using for substrate, sand or crushed coral? What is the temp? Are you adding any trace elements to the water? Is there a skimmer? Is there an "oil slick" on the surface of the water? Is there a power head in the tank?
Sorry for the number of questions, but the more you can tell us the faster and more effectively we can help you and your fish. You'll really want to put a rush on checking that calcium level, though. Nano tanks are great, but the rate of change/fluctuation in them is incredibly fast, so time is of the essence.