Acro Frag Not Extending Polyps?

[GMGQ]

Here's a pic of the frag I got about a month ago:


It's pretty much been the same since I got it. When I got it (from OA), there were polyps extending from it, which looked cool in the light.

But those polyps havent really been extending since I got home. I put it higher in the tank, because I read that it requires high lighting. But the polyps were totally retracted. I put it on the sandbed, and the polyps sort of peeked out. I tried putting it at a medium level with more flow, but that didnt seem to help.

So where's the optimal place to put it?? Thanks.