When I first got my Squamosa I put it up on the rockwork because I have a bulldozer fighting conch that would plow it over, but every morning I found it on the sandbed and seemed happier there. So I left it there and it's doing great in a 5" sandbed about 24" under a 250 10k MH. The conch only hits it about once a week. If it were attached to a small rock under the sand it probably would get injured, but there is nothing but sand so it just uprights itself in a few hours.
Mike