Here's what my ciranolid trap looks like. (Excuse the focus, this photo was taken in complete darkness) Using three of these, I caught exactly NONE last evening. Yes, the entrance is a 1/8" hole in the cap. I'll try again tonight. The trap is unchanged from the one that caught 25 the night before. Hmm...as always, patience is the key. The yellow tang has been "latched onto" twice more since the original photo. In both cases, the ciranolid was much smaller than the first one. I guess they must like the colour yellow. So far, the tang is showing no ill effects from his nightly blood donations.
(in case you are wondering, the film canister is in there for weight to keep the trap from floating around. It is filled with stainless steel nuts)
And just to show that the tank hasn't been devestated by ciranolids, here's a side view update. I think this is the first posted photo since I got the orange tree sponges mounted.

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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