A few years ago i made the mistake of picking up a 40Lb bag of play sand for my 55 gallon freshwater tank. NEVER AGAIN, it look's awful kicks up a hell of storm, clouds very badly no matter how much i washed it, Scratched the tank up badly. And since i was using 2 marineland Emperor 400's the sand kicked up by my Cichlids destroyed my impellers. The sand can also be picked up by magnets If you have a canister filter i'm sure it's fine to use, but it just looks dreadful. Hit up petsmart NOW while the sand made by CaribSea is on sale. 30Lb dry sand was only $12
Do yourself a favor and don't cheap out on the sand.