07-17-2012, 07:24 PM
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You could try prazipro. It's expensive, and will not treat all internal parasites. So it may work and it may not. You could also try lavamisole. It's not easy to find though. Levamisole works by paralyzing the parasites, which allows the fish to pass them, so you would want to treat them in another tank. 3 treatments are required since the eggs will not be passed. No guarantee that will work either, without knowing for sure that's the problem.
It could possibly be a bacterial thing, in which case treating with maracyn and maracyn 2 would handle both gram positive and negative bacterias. These meds are also expensive., ESPECIALLY treating a larger tank. Again, without knowing for sure that's the problem, it's just a shot in the dark. An expensive shot at that.
You could try the treatment suggested in the link I provided you.
This is all part of why I don't bother treating such fish.