08-07-2012, 12:39 PM
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I agree the barb has been the victim of relentless attacks. But it might have come from more than one of the other fish.
The Red Tailed Shark can behave like this, as i have frequently tried to get others to recognize. But so can the Chinese Algae Eater (the white fish in the photos). Either of them have a habit of taking a dislike to upper fish. To be safe, I wold re-home both the shark and the algae eater. Then consider appropriate fish to stock your tank. Our profiles give compatibility issues for each species.