I just set up a 55 gallon and I would like to put sand in it and have it settled before I put the fish in it. I am running a tight budget now and don't want to spend much money and definitely don't want to buy the expensive stuff at petco/petsmart. Other than pool filter sand, I am unsure of if anything else works. I was told I could find pool filter sand at home depot, but when I checked they either really didn't have it or it went by another name. There were several kinds of sand; play sand, tube sand, leveling grouting sand, but I didn't want to waste my money on something that wouldn't work. If I can't find it within this week I will just use some cheap gravel I found at the landscape store. I would really like to try sand for once, but if I can't find pool filter sand, will anything else work? Can someone please clarify?