ReynoldJB

Why Do I Have Fin rot On My 9 Tinfoil Barbs In a 75 Gallon Aquarium?

I am wondering if anyone can tell me why my tinfoil barbs have fin rot? I have a 75-gallon aquarium with catfish, black skirt tetras, and tin foil barbs. I have plenty of filtration, steady temperature, and the like. We have quite hard water here.

The only fish that have fin rot are the tinfoil barbs. What can I do to cure this? The tinfoil barbs are growing fast, but they do not have any fins. What am I doing wrong?

Butterfly

Maybe somebody is nipping them? what are your watert test results (ammonia, nitrites and Nitrates)? How long have they been in that tank? How long has the tank been set up?
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