| Re: Sick Fish NEVER rinse bioballs with anything other than tank water.Don't stir gravel.Get a siphon with a gravel cleaner and clean it that way.White fuzz on the nose could be Columnaris.If so the fish is most likely already dead and just hasn't figured it out yet.Have you tested the water for ammonia,nitrites,pH?When you have multiple fish breaking out with multiple diseases water quality is always a factor.You should change a minimum of 25% weekly.Bioballs never need to be changed.You can try treating the infections with an antibiotic(terramycin is first choice for columnaris) but results are spotty ime.As far as the ich goes Boesmani Rainbows are easy to ich proof because they like quite a bit of salt in the water.Unfortunately your Cardinals won't be so appreciative.This is the main reason why I don't like mixing fish from completely different types of water.The main thing is to keep up on the water changes!You have chosen a very tough row to hoe.Good luck!
John
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