I'm treating my fish for ICH using a chelated copper treatment in a separate hospital tank. I added a sack of porous media in a sack in the hang on the back filter that has been soaking in my display sump for months to make sure there is beneficial bacteria in the hospital tank. but I'm having issues with ammonia so i wanted to add bio spira to the tank to raise the bacteria levels but i heard from the people at instant ocean that copper kills beneficial bacteria. is this true? if so , can a skimmer remove ammonia? i have one in there now (tunze 9011) and its not very affective so far. anyone know?