Hello and thank you. In the two side by side I am using fine white fw safe sand.I googled Estes white sand, and a company came up and I bought it from them. They sent something made by the same company and it is even better. The reason I say that is the estes sand would partially float for a few days. This instantly stays put on the bottom. I like it much better.
On the third one I am using Tahitian moon sand,which is actually a fine gravel.
Last edited by keepsmiling; 10-12-2013 at 05:47 PM.