In your "sick coral" thread, a couple minutes ago I suggested you consider moving it onto the sand because it looked like it was on your rocks! Did you "correct the problem" by moving it up onto the rocks?
They really want to be on the sand, but as mentioned by others here, having sand blown onto them will cause them to spend a lot of energy getting rid of all that debris. Maybe that's what the guy's problem has been all along?
You'll probably be better off changing your flow pattern around, or finding another spot in the sand that has less flow. I've had to do both of these things once I got an open brain like that.