Thanks for everyone's help. I didn't want to treat one fish and lose the BN and Cories as a casualty of the antibiotics. I enjoy all of them.

New to this forum so not sure if this is where to post this. I have a 4 year large cichlid in a 125 gal. tank with 2 other cichlids, 6 small common cories, and a Bristlenose. One of the cichlid's developed pointy hard-looking nodules all around both eyes which I treated successfully with Ampicillin ...