just my two cents! I have six and they all roost up close to each other, generally, usually at least one actually stays on the sand! From the advice given on this board, keep your roost in the middle and low enough that they cant really "sand bathe" in the PDZ, and I used old plastic lunch trays I found on Ebay so if they get wet you could clean them, although with about 1 inch of PDZ there is very little moisture issue.