You may know this already but I figured I'd chime in. One issue with the fine aquarium sand is that it will get in your filters and toast them depending on the type of sand that you get. Also, black diamond blasting sand comes in 3 grades that I know of coarse, medium, and fine. And can be found at Tractor supply.
I had no idea that this was the case. Thanks for the heads up, but now I have to rethink this