I haven't gotten my cham yet, but I want to put his environment together first before I get him and I have heard mixed things about substrates. I am planning on building my own terrarium and it will be round so terrarium flexi liners are out of the question. I wanted to use the sand that is not harmful to the cham, I think its calcium based, but anyways, then I thought of using papertowel with a thin layer of very small pebbles so that he doesnt eat them and he can see his food. Any suggestions? I just want something that looks nice but the health of my cham is more important! Thanks