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The last McCosker I had, about 2 years ago, had chronic bacterial infections that I had to treat with Kanaplex every 3-4 months. He'd just start looking "hazy" on the fins and side. Are such infections a "thing" with McCoskers?
Unfortunately NFG in QT is probably your best choice (nitrofuracin green). It is a tough choice. You can just hope it goes away on its own, but I don’t see that as likely...It just sucks because getting him out of the tank for real treatment isn't really an option. There's no way to get him out, that I can think of, without removing every single rock and putting all of my corals at risk. Not to mention, I already have a rescue fish in my QT for treatment right now anyway. My only real hope was to treat him with Kanaplex food (and hope the problem was bacterial rather than viral) but I don't think he's eating enough at this moment for that to make enough of a difference.
Unfortunately NFG in QT is probably your best choice (nitrofuracin green). It is a tough choice. You can just hope it goes away on its own, but I don’t see that as likely...

