04-28-2008, 02:37 PM
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While I'm glad that the medications worked for you, please be prepared to face many more problems if working with a 95liter tank (25 gallons)
Even 1 black moor can't stay in a 25 gallon tank for more than a few months... and knowing that there are other fish (you still haven't told us how many others and what kinds) I would expect the problems to set in rapidly.
For 1 - 2 black moor goldfish, 75 - 90 gallons is a minimum. If healthy, these fish grow very rapidly. They have large amounts of waste output, and are known to be messy eaters. They also consume a larger amount of oxygen than most fish. Small tanks = death when it comes to goldfish!
Full grown black moors average about 8 inches... that's a lot of fish! For a 1 - 2 inch moor to reach 4 - 5 inches within the first year should be expected.
To make the 25 gallon tank work as a temporary home for them, until you can get something larger... water changes at least 3 times/wk, 25% each time, easy on the food, and extra air stones are all going to be needed. Keep temp low. (65 - 68 degrees) The warmer the water the less oxygen content in it. Maybe even try heavily planting with anacharis, this provides a natural and healthy food supply for the fish and it'll help to consume at least a bit of the waste levels until they eat it all... and anacharis will release oxygen bubbles into the water as it grows if it's healthy and lasts long enough. Oh, and pack your filter with plenty of carbon, and be sure to replace all carbon about every 3 wks.
These things will buy you a small amount of time, but if those fish are healthy, stay healthy... they won't be long in a 25 gallon tank... maybe a few months.
Oh, and lastly... in answer to your question about the illness... it is very likely that the size of the tank and water quality, overcrowded conditions, etc were either responsible for the illness happening or at very least contributed to it. Dirty/polluted water will weaken the immune system and cause internal damage to a fish. Once the immune system is weakened the fish is open to any number of illnesses, and any internal damage will also hinder recovery. Please don't ever put any kind of goldfish into a 5.5 gallon tank again, that is simply cruel to the fish and impossible to make work.