Just as an alternative you can use pool sand as the base and put the pisces on the top of that. Keep the pool sand away from the glass and nobody will know it is there. I have found it to be much cleaner than play sand, no clay content, so nothing is lost when giving it a wash and cost about $23 for 20kg bags. The other advantage is that it is a rounded sand, to allow water to flow through it, so is less likely to get anaerobic build up in your deeper sections.
As an added bonus you can add live black worms from your LFS and they love to go deep in the sand. This helps to aerate the sub and is a source of food for your fish as well. My shrimp tank has a grass mat of worms poking up every morning as they dont eat them but i do see some worms poking up in our angle/gorami tank every so often so i know they are still in there.