the fish that I'm writing about are new purchase fish not ones already in my tank, no I have not been able to treat the red sore successfully, no the fish dont exhibit fin rot but I have had success with api meds for fin rot on other fish, the fish seem healthy and eating when I get them but just hang out by the filter intake sponge with lights on, as far as water quality I'd have to check it, I drain water from my reef tank and use that for the qt tank
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