I like the caribsea special grade. It's fine enough that any sand sifter or burrower is happy with it, but not so fine that it blows all over the place all the time. My only complaint about it is that I wish they did a thorough job of rinsing it before bagging. You really need to rinse the heck out of it using a filter sock and garden hose before adding it. Even then, you'll still have a dust storm for a few hours.