Sorry I forgot about your question about the sand. In all honesty it will kinda go where it wants to anyhow but IME mine did prefer to hang out near the rock/sand interface. Actually now that I think about it, he attached to the bottom glass near a rock stand and dug the sand out of the way to do so.
If memory serves, sometimes when they are small (like <8" or thereabouts) they sometimes hang out higher up on rockwork but they eventually migrate down as they get bigger.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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