| Don't inject!
Not an Ulcer and why treat with antibiotics in this case? It appears to be a wound that is healing or at worse stable. Sedate the fish and treat the wound. Keep the water quality high, take the pond off feed and add salt to the system. I'd use PP as a paste and then retreat in three days if needed. The trauma of an injection is simply not worth it unless you have your back up against a wall. With out properly culturing the bacteria and then testing the culture for sensitivity you are just throwing darts in the dark. One man's opinion.
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