It seems many people use sand in their CP mix. *Why is that? *I don't understand how the sand helps. *I heard that it keeps the mix light and aerated. *This doesn't make sense to me. *It seems sand would compact down quite easily. *So what is the purpose of having sand in the mix? *I'm making a mix for my pygmy gemmae (they should arrive in a week *[img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] *). *How much sand should I use? *Thanks.