CC, if it's columnaris, and it sounds like it is, you should LOWER the temp of the tank. Columnaris thrives in warmer water. I'd drop the temp down to 75 or 74 for the duration of treatment. Sorry for your losses.
I've had good results with a combination of Maracyn and Maracyn II on columnaris and secondary infections.
Mark
I've had good results with a combination of Maracyn and Maracyn II on columnaris and secondary infections.
Mark
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