I have a sand bed that goes from zero depth to maybe 3" depending on where it gets moved to.
It used to get quite nastly looking, which forced me to vaccuum every now and then.
Since adding the pair of Sleeper Gobies, my sand looks spiffy-clean all the time! No more vaccuuming... I now use that time blowing sand off the corals! Sigh...
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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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