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Just make sure that it isn't a black isopod or other parasite of some sort, can't tell if it is a burn mark from a coral or a parasite from the picture. Sometimes yellow Zebrasoma spp. get a small parasite similar to this (google "black Ick") that is treated with a freshwater dip. Look really closely at it with a magnifying glass, if you really are not sure, do a FW dip to see if it falls off. I think most likely it is a burn from coral, especially if you have no anemone and you DO have Euphyllids in your tank, this is common under those conditions.
HTH
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Tom <"))))>(
(TDWyatt)
Wise men speak because they have something to say; fools, because they have to say something. -Plato
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