What is the best way to treat a catfish for Ich. My small Tigrinus was exposed to some Red Hook Silver Dollars that I believe MAY have had early stages of Ich. They had a few small white raised dots on their fins and bodies. They were immediately removed from the tank containing the Tig. The Tig doesn't show any signs of it or any spots at all that I can see, but I want to be ready of he does!! What is the best treatment for a Tig if he should develop these spots? From now on the Tig will live alone, I'm not risking it again!!