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I noticed my fish has holes on the side of its "gills" and i do not know if it is a disease. I do not see it on any of the other fish, and i keep the amonia levels how they should be., I have a filter, and i make sure i keep the water clean. I do not know what is wrong with it. The gill looks kind of puffy. Help!!!

I noticed my fish has holes on the side of its gills and i do not know if it is a disease I do not see it on any of the other fish and i keep the amonia levels class=