Its a "catch 22" situation...if you remove the sand where is she going to dig to show you that she has to lay eggs....and that would leave you having to look for the subtle signs that the female is ready. If you leave the sand in there then they might/will/could eat it...and depending on what you put in the container it could lead to an impaction. Like I said, the Kings sand that I have used for years has never caused an impaction....and I used to take every single chameleon that died in for a necropsy...so I know that for sure.