I have had ghost shrimp in my planted tank and they seem to like the sand alot. They actually spend quite alot of time swimming and feeding off the plants and hanging out on the taller plants near the top. I know that they molt and become very vulnerable after they lose the shell, and placing a very small piece of broken pottery to provide a hiding place is a good idea. I have never bred them but I have read of it being done. If you google ghost shrimp there are quite a few excellent links....cant remeber the exact one i am thinking of, but good luck!