what colour is it changing too? If it's just pigmentless or 'opaque' looking blotches... (especially) up near the dorsal area, it could be a parasitic infection like brookenella perhaps. Is it 'flashing' or scratching up against rocks?
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45 gal fowlr,
fluidized bed, UV ster, Rimora skimmer
25lbs Fiji / African LR
1 percula clown
1 diadema dottyback
1 6 line wrasse
1 juvenile picasso trigger
1 Coral Beauty
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