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I just tested the water in my tank and the nitrites and nitrates are both nearly 0 (barely pink, but close enough to clear that it is essentially 0), the pH is about 7.0, and ammonia is also between 0 and 0.1. This sick tiger barb is in a 20 gallon tank with 4 other tiger barbs and 3 electric yellow cichlids, as well as a small common pleco. all of the other fish are in good health and appear fine, but this one is showing signs of fin rot, sometimes loses it's equilibrium, is showing white patches across the bottom of its belly, and has started to suck at the top of the water. the fin rot i had noticed before, but have changed the water since then and was hoping everything would get better. but, just today, i noticed the white spots, loss of equilibrium, and breathing at the top of the water occasionally. any ideas on how to treat this, or what its problem might be?
thanks in advance,
brian

it sounds like columaris, here is a link.http://www.flippersandfins.net/flexibacter.htm