He's eating just fine. The redness in the pics above are only visible when a flash is used. Otherwise, it mostly looks like white, slightly peeling/flaking scales.
He's getting a frozen mix of a seafood blend for carnivores, frozen brine shrimp, frozen brine with sprirulina, and flakes.
The frozen preparations are doused with a garlic treatment (which they all go crazy for).
He only spits it back out when he takes a big bite (the size of say, a pencil eraser), and then its just part that he spits out. He will usually then go after the rest a few seconds later.
, where I got him, after showing some big full-sized photos, thinks it looks like a wound, especially since he doesn't have any other symptoms of being sick, and as long as he's not being lazy, hiding a lot, and eatin well, he'll probably be okay (unless he gets a bacterial infection).
New photos/updates, 4/27
These aren't as sharp, but the guy is moving around too much for me to get a good shot. I think the flash freaks them out.
A little worse, and a little different looking tonight. Now its like two parallel cuts - almost like he was clawed (that's just for the mental visual, I don't think he was clawed). You can see hints of this shape in the earlier photos.
Earlier today the area looked better, I think the cleaner keeps removing scales. That's what this looks like - dead scales, exactly like a wound (but one that keeps getting re-injured). Its all white, not fuzzy at all. Just like peeling skin/scales.
He's still acting fine, still eating fine. I tried to catch him, had a QT tank all setup, but he's too fast, nearly jumped out of the tank. If I can't catch him, I can't treat him with antibiotics.
Is there anything that will slow a fish down? Maybe a shot of vodka? (just kidding!)