I think you should remove that strainer on top of your Herbie drain. It is small and will just clog up all the time and mess with your Herbie. The teeth of you overflow should prevent critters from going in. Cover the top of the overflow box.
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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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