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He is fine. Just swimming about as normal. I have only just noticed it and he only has the redness on one side. Doesn't seem to be affecting him in any way. Don't know weather it's normal or not.
Could be a little odd just on one side. It doesn't seem so bad and I find sometimes it is just natural colour from light coloured fish. I would see if it spreads, check the ammonia, ph, nitrites and nitrates anyways and up the pwc's just in case.