I used some of the CaribSea SuperNaturals White sand over my mixed FloraMax substrate. I used about 1.5"s over the top. Only gripe I have is constantly having to sift out some of the bigger rocks that my goldfish (Destroyer of Worlds) throws all over the place. I would highly recommend getting the black stuff as Aqualady mentioned, they dont stand out near as much (and LOTs cheaper). But i really like the texture of the SuperNaturals, almost like a soft velvet and I havent tried the sand she suggested.