Deep sand bed?

Phroger

Reefing newb
I've just recently added a deep send bed filtration section to my sump (approx. 8 inches deep) and was wondering from the people that may have them as to how to keep the sand clean. I know in the main tank, I have to use sand filtering fish and inverts but was wondering if this would work in the sump as well and how would I keep them in the sand section? Any help is greatly appreciated.
 
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