Nope that's not so normal... it looks like the tissue receded away from the skeleton and it is exposed... is it possible that while you were feeding it last night a shrimp or crab could have agitated it to steal the food you were feeding it? This may have caused the irritation and recession.
i think a crab mite have been tryin to steal its food. Will it get back to normal or is it a loss? I'm doin a water change today as well. Everything else looks great in the tank!
As long as noone else bothers it, there is a chance it will recover. Just keep an eye on it for a few days to make sure the tissue doesnt degrade any more, and hopefully itll come around.
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