04-05-2011, 04:14 PM
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I've just been doing some research on fish diseases, trying to find out what's up with my tinfoil barb. Your description made me think of either external parasites (scratching on the rocks behavior), or a thing called the "shimmies", which, as best I can tell, is a constellation of problems. Anyway, maybe google those two things, and see if anything strikes you as particularly familiar with your problem. I believe there are good treatments for both those problems which you may wish to consider for the rest of your tank.