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Well I'm certainly no expert, but I think an amonia spike in the water can also cause fin damage
His bowl holds 2 1/2 gallons, and the water is new so I'm sure it isn't dirty yet---The bowl is brand new and fresh from the manufacturer though. Have you ever heard of toxins leaking from the plastic of a fish bowl? I suspect he could be mostly stressed, if stress can cause fin rot, and I've let him be with a towel covering the bowl for security.Saucy said:Just try adding some aquarium salt and heat... how big of a tank do you have him in? If it's too small, it may be that you just need to clean more.. I know, annoying.
You could also try giving him a JFE (Jungle Fungus Clear) tab treatment. There may be something that he brought home from the pet store that is attacking him now.