What else should I be testing?

[plutoniumJoe]

Originally Posted by MarkoD

im running a UV sterilizer on the tank now. wont that kill the free floating ich in a few weeks?

It will reduce ich that is in the water column but even if a fish does not show signs of Ich it can still be a host (I think) and therefore you will be simply re-introducing you fish into a tank that has ich present. Some believe that this is all tanks! If you fish are strong enough and have a strong immunity system they should be able to fight it. Otherwise you are back where you started.