"TheRock" wrote in message news:7qRif.567$gi3.546@trndny09...
FYI: I used silica play sand. Works great...
Been up for 1 year.

And you do not have problems with too high silicates ?
No brown algae ? I know people using Hi-Si filters
to get rid of silica from the tap water and your usage
of silica sand must elevate silicates in the water... :-)