Rhomboid infection/wound

[Unthinkable]

I noticed today my rhomboid has a white spot/wound near his tail. The scales in the area are raised and the area is noticeably puffy. I don’t really have any rocks that could fall in him and my tank is pretty passive but I do have 2 anthias and 2 tangs that maybe could have attacked him.

He’s swimming fine and eating Well. I watched him for a good hour today and I didn’t see any chasing. Could it be anything else? Should I start up a QT And medicate or observe for a day or two? I haven’t added anything to the tank in quite some time so I don’t think it’s a parasite. Here’s a quick vid, sorry for the jitters he’s fast even with the wound

 

[Big G]

Looks like a wound or injury.
Treating with methylene blue is an old school method that still works well.

And then with antibiotics if necessary. Look for white filmy areas, redness, or necrosis.
Here's a thread with a nice list of antibiotics in order of preference:

Antibiotics

Antibiotic treatment What It Treats – Bacterial infections, which are oftentimes “secondary” to preexisting parasitic (and worm) infestations. How To Treat – Follow the directions on the label of whatever product you are using. Always use a broad spectrum antibiotic medication i.e. one that...

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