So I was not home the other night and in a matter of 24 hours most of my tank had died. They had some type of white fluffy thing on my fish, kind of looked like a fungus...I think. It is a planted tank and the plants are fine. I had about 10 tetras die as well as a german ram. I saw the my EJBD were breathing towards the top of the tank so i decided to throw them into a quarantine because I had nothing to lose at that point. They seem to have completely lost all the affects of being in the other and are behaving normally. What should I do with the tank that was/ still is infected? I have Melafix, Pimafix on had right now. Please help me out.