Has anyone treated for a stubborn fungus with potassium permanganate? I've never used it and am really nervous about killing the fish.
It's something in the damn tank that keeps coming back. I'll pull fish out, they get healthy, and then they go back in the tank and boom, fungus. I don't really have room to QT them all at once, so I was thinking of trying the PP as a last resort. I've tried everything else I can think of - salt, pimafix, methyblu directly applied...I do huge water changes (70%) weekly, and the tank is way overfiltered.
My next step is to stick them all in a huge rubbermaid as a QT tank for a week or so and while they are out, take the tank completely apart and bleach it to death, or nuke the tank and filters with PP while there are no fish in there. Killing the biofilter isn't an issue as long as the fungus dies.
I'm putting a UV sterilizer on their new tank in hopes that it will kill anything else, but I'd rather have them fungus free before they move in to their new home.



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"bleach it to death." I had used med to treat fungus on goldfish very effectively. Forgot the brand (Tetrafin maybe). Gave my left over to someone when he was looking for some on a weekend. It is a Yellow powder that comes in a small container. 