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Looks like an infection to me
Looks like an injury turned into an infection. We'll see what Humblefish thinks. He's our fish doctor.
^^ This & this. Due to the severity, I don't think food soaking an antibiotic will work in this situation. However, if you can't QT at least start soaking his food in Kanaplex also using Seachem Focus to bind the medication.
If you can QT, dose Kanaplex or Furan-2 into the water for at least 10 days. Combining Kanaplex + Furan-2 + Metroplex will afford the widest spectrum of treatment.
I have tried for three days to catch this guy but my 500 gal tank affords way too many hiding spots. Looks like I'm gonna have to feed all the fish the medicated food. Guys at local store suggest Metroplex. Any other ideas?