So I'm going to restock my 10 gallon as a tropical tank, as my research on those fish are done. I want to go with sand for the substrate. Here's my problem though. I've used play sand in the past, and it has worked good. But I want to try some pool sand so I can have something whiter/ cleaner. My researching online hasn't done me much. I need to find prices, and locations to buy pool sand for cheap. The rule would be a pound per US gallon, right? Anyhow, are there places other than pool stores that sell this? If not, I'll end up just buying play sand. Thanks for your help.