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One of my fish has developed ulcerating sores on her mouth. Although she is still eating she doesn't move her lips much. I started treating her with erythromycin. Any other ideas? I don't see signs of fungus.
Sounds like that might be Mycobacterium infection, in which case there is no reliable treatment, but Kanamycin seems to slow it down in some cases. Sometimes Myco can go into "remission" for months or even a year or more, and the fish may still breed and produce healthy offspring, if you can keep her appetite up. Eventually it starts growing again and slowly kills them, IF that's what she's got. I've seen Laetacara and Kribensis live for 1-2 years after start of Myco symptoms, but Apistos and rams seem to succumb to Myco in a few weeks or months. If it's some other bacteria, you might try the Metronidazole and Naladixic acid combination that Mike recommended on another thread.