If it is the coral eating type, you'll know because in order to eat coral they have to latch on and rasp the coral away. They remain there for hours, if not days. Once you see this behaviour, you can simply remove it with tweezers.
If you don't see this, it is probably safe to assume that you have the harmless detrivore type. In this case, I would leave it in the tank.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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