This is the 2nd time this has happened in the 13+ years that I've owned this green carpet 'nem. There was a full moon last night....coincidence? Probably.
The carpet changes its shape into a cup. This seems to limit the water flow in over the mouth and concentrates the sperm in this area. If not for the actions of the host clown, this would have pooled in the bowl formed by the anemone.
If you have ever dosed coral snow into your tank...that is what the tank looked like after an hour or so!
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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