I know its nothing like some of the tanks here. My 20gal and I am using a Penguin Bio-Wheel 350 for it Got the fine gravel in the bottom almost like a large sand. Easy for it to burrow if it likes. Now I just gotta wait the 2months or so to get it cycled in. Guess that will give me ample time to decorate it all for it. Hopefully I will have good luck this time again as I did with my last octo.