One of my sumps is full of rock. I do agree with the previous post, however. Every now and then, I grab a rock or two and shake all the crud out of it. I also vaccuum out the detritus from around/under the rocks every year or so.
If I had to do it again...I would build a detritus settling sump, prior to the main sump. Maybe one of those cone shaped tanks with a drain on the bottom...
Filter socks might do the same thing, but I don't use them.
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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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