I've noticed lately that my 2 black skirt tetras are acting a little weird. Upon further investigating I noticed a hole in one of the guys fin. I don't have any aggressive fish that I'm aware of, so I guess my question is, how do I treat this? Tank is a 55 gallon community with 5 red fin tetras, 2 green coby catfish, 2 frogs, 1 mini pleco, and 2 snails as well as the 2 black skirt tetras.
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