09-12-2011, 08:19 AM
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Ouch, that looks pretty bad. I've never had a fish with open wounds like that before, but the advice that I've gotten and seen others get is just to keep the water very clean, cut back on feeding, and they will likely heal on their own. With fish who aren't sensitive to salt add 1tsp/gallon to the tank. With your catfish I would only add salt if there is no other medication in the water, and cut it down to 1/4tsp/gallon.
I don't know about the maracyn I and II. Are they supposed to be used in conjuction?
It's hard to tell if the featherfin still has signs of other disease, or just the open wounds. I know some members have still told you not to bother separating if they all need to be treated, but if you have several different diseases and therefore several required treatments, I still think separating them would be beneficial. In the case of your featherfin, you can easily change 100% of the water daily if he is by himself (or change 90%. Leave in just enough water that he is comfortable if you are treating the main tank with medication he shouldn't be exposed to). But it is up to you - like I said, I don't have direct experience with this sort of open wound and infection so I am going on speculation and second-hand advice.