Modifying an aquaclear?

I'm going to be setting up a 20 gallon reef soon, and I was planning to use an aquaclear filter for flow, and so I could put a little fuge in, as I'm not planning on a sump, but how would I do this? I've seen it done before, but do you just stick sand, rock and macro in and hope for the best? Should I be worried about sand getting kicked up in the 500 GPH of the filter? I may use somewhat coarse sand, but still...

Anyother tips from people who have done this are also needed/wanted.
 
I would skip the sand and instead use pieces of rock rubble at the bottom...then place your micro-algae(cheato) on top of the rocks. Also, get yourself a small clamp on light for it, to keep your micro algae growing.
 
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