The Haddoni that I have in one of my tanks has actually taken more to the rock than the sandbed. Although the rock perch that it has taken is only about two inches higher than the sandbed, it just has anchored completely on the rock and could care less about being down in the sand. When it is open fully, it rubs on the sand occasionally, so it knows that the option is there. It's ok, both the Haddoni and the Clarkiis are happy and in love no matter where it's at. LOL. BTW, our sandbed is about 3-4 inches deep in that tank, and it just seemed to prefer the embed its foot in LR instead.