I agree bubba's. Tile is the way to go. In the past i used calcisand, playsand, paper and I have to say tiles are the best solution. Very easy to clean, you can even bleach them, sanitize them, and the viv will smell a lot better than any sand you could use. The smell from poo tends to get absorbed by the sand, I think than tiles are a lot more sanitary. I just finished my permanent viv for Lucky and I used natural stone tiles. I did'n grout them, I just set them really tight, that way I can remove them to wash them, etc., very easy to clean, plus if any worm gets out of the feeding dish you'll be able to see it without digging.
hope this can help a bit.