I use to run a sand bed in my sump...but because it wasn't moved around, and I run Kalk into the sump...it eventually solidified.
I decided to remove it and did so by siphoning out the sand as much as possible every time I removed water for water changes. All the released crud is siphoned away as you go. There was never any impact on the tank at all.
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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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