I have a 5 month old female Veiled that was big to begin with and has grown rapidly, so I want to be prepared in the case of eggs. I see that every one uses different things in the egg laying container. I wanted to provide her with a container to dig in just in case. I was thinking of filling a medium sized cricket keeper half way-3/4 way and just keeping it in her current cage. Now-do I fill with topsoil, sand, or a mixture of the both. Does topsoil need to be "washed" at all? I know that people recommend that playground sand needs to be washed. How about Zoo-med Reptisand? I am not planning on breeding her for a few more months at least.