i used it on the very bottom, added my sand then rock, its just piece of mind that i dont have rock sitting right ontop of glass, the only time ive ever seen my egg crate is when my yellow had a freak out and knocked over a rock, other than that theres a good 2-3 inch sandbed, i still see pods(or other crawlers in the sand) and a happy sandsifting starfish, snails, and a small horse shoe crab
so i really think its personal preference
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