Temp swings of 2C is chasing up the wrong tree I think. My temp regularly (aka daily) swings by 3C from 79 at night to 82 during the later parts of the day. My fish, corals, inverts and other flora and fauna seem perfectly adapted to the environment.
I suspect there are water chemistry issues at play (ammonia, nitrites, pH) or physical causes (agression from another animal, irritation from corals, etc) that are the root cause of the markings here.
I've never heard of temperature swings causing burn-like markings in a fish. Perhaps encouraging parasitic or bacterial infections, but not burn like scaring.
Just my $0.02 worth. :?
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Cheers,
Andrew B.
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