04-23-2010, 12:57 AM
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Can you post a photo please? There are a few different things that can cause such a problem, so can you also please post tank stats, water params for ammonia, nitrite, nitrate, and pH... a list of the foods you're offering, how much/how often, and tell us how often you do water changes, and how much water each time? Also water temp and if there are any other fish in the tank, if so what species and how many of each?
How big are these fish?
The more info you can provide the faster we can help.