I spent about an hour observing the nudibranchs on that coral. It wasn't too difficult to see that they were in the process of decimating that coral. The larger of them was easily ingesting polyps at a rate of about 1 every 2 minutes and they were very mobile.
So...spent another hour or so picking them off the coral with tweezers. I haven't tried to exterminate them, but I have removed 6 or 7 of the largest ones.
At the same time, it was convenient to watch the sea spider a bit more. He is also eating this coral, but the pace at which he does it looks much less destructive, so he's going to remain.
It seems that if you stare at anything in this tank long enough, you'll see something new. There are at least 3 of what appear to be mantis fry attached to this same coral.
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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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