Try to keep the live rock off the sand as much as possible to get good flow in your reef. I (and others) do this by making stands from PVC. Like these: 
I ended up cutting them another 1/4 inch shorter in the end (the sand settles and reduces in height) but the finished look is nice: 
Once I put little colonies of zoanthids, mushrooms, etc. around the lower reef, the coralline takes hold, and the sand blows around from the pumps, you'll probably never notice the stands.
Dave
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
If you're looking for me, and I'm MIA from the board, email me at JustDavidP (at) gmail (dot) com.
Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
