You can take advantage of trigger fish behaviour. If you can fit a small vase or glass down into the overflow, the trigger will hide in it. You will then be able to remove the glass and the trigger will try to remain inside rather than flee. Best if the glass/vase is small enough that he/she will be able to "lock" themselves inside the way that triggers do.
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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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