I assume you plan BB tank? If so and you want leopards etc just add some sand under the rock structure or a sandbox hidden under the rock or in the back of the tank. i think I have seen rock looking sandboxes you could add.Interesting. Setting up a 230g and looking for some good wrasses. I do like the sand burying ones like leopards etc. Wondering if a "sandbox" is a good idea or if I should just do some other wrasses dont need sand. Thoughts?