02-07-2010, 01:26 AM
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Can you please post water params for ammonia, nitrite, nitrate, and pH?
Can you also post a picture or 2... of the fish in question and one of the whole tank? It is often that photos help more than anything else, especially when dealing with fish issues via internet.
This could be as simple as stress... or it could be something more. At this point the information is pretty limited and doesn't give us much to work with. Can you please provide more info, such as what acclimation procedures you used when bringing the fish home, what foods you have been offering and how much, how often, how long after setting up the tank did you put the fish in, what type of filtration you are using, etc etc. The more info you can provide the faster we can help you sort things out.