Angels are notorious for flukes. If you are unsure of his past, it’s worth a thought to treat with prazipro. It is reef safe, will kill some worms and feather dusters but otherwise safe. I don’t think they would be causing the fading though.
If he is eating fine, like others have mentioned, keep up on your water quality and observe. My favorite fish but am too afraid to chance one with my sticks.
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