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Colin1418
Charles4157
If it's bacteria, you can try baths with broad-spectrum antibiotics - it might help.
Joseph
try giving fruits and salad with paprika... to support him, give a cube of frozen food with tweezers personally...
Is he UV basking?
As for the antibiotics, it's true... I might even get a separate aquarium for him so I don't have to catch him all the time (extra stress)... Maybe he has partial vision loss since he can see the corals... maybe he's getting old...