I'll vote for tunicates as well. I belive that the pineapple sponges have only 1 primary hole and they look more prickly, while the tunicates always have 2 primary holes and look glassy. My completely non-educated opinion only.
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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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