One of the sponge filters is new and one is very well established. I haven't cleaned them out since I started the QC treatments. This morning after 3 doses of QC, the fish look even worse. The tank is very cloudy, the white film is getting worse and now on all the fish. fins still clamped. About the only positive thing is they are still eating, though not nearly as well as when they were healthy. I'm lost at this point. Really don't know what to do. I'm thinking big WC (60%), cleaning the filters and adding salt again. Or should I be doing another QC treatment??? Any ideas?