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Yeah either pool filter sand or play sand. I used Quikrete Premium Play sand, it was about $4 for a 50lb bag. I used about an eighth of what was in the bag for my 10 gallon. Pool filter sand is a little larger in size and will help prevent compacting to a certain extent. Just remember, if you got with sand, you will have to stir the sand every week or so that pockets of poisonous gas do not form under the sand.