I have maybe...one hundred of them...I don't know. Their most troubling behaviour is a habit of collecting in large numbers on SPS during the daytime. "Group huddling" behaviour that blocks the light getting to the coral. Other than that, they've never been a problem. I don't know if they are doing anything particularly good or not....Food for the mantis, I suppose.
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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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