i have had her for about 4 years. she started off in a 20gal. then i broke down my 180 salt and she has been in there for about 3.5 years with all different types of fish
i used sand because when she was small she used to bury herself but now she kind of hangs on an artificial plant near the top under a uv reptile bulb. so now i dont think it would really matter either way