[jfoster38122]

http://semcodist.com/Gravel/gravel.html

 

[Wingsdlc]

I am sure some of them would work just fine but from the web site pictures it's hard to tell how large or small the stuff really is.

 

[Rex Grigg]

If you mean plain old sand then lots of people have used it.

 

[Kelley]

Do be careful with some of those gravels. You will need to test them by pouring muriatic (hydrochloric) acid on a sample. If it fizzes, then don't use the gravel. I t will raise your kH over time.