I have panther chameleons and I was woundering about soil to put in the pots. Is it ok to put in some dirt from the backyard or should I buy special soil? and if so what kind? For real plants how often should I change soil? Should I put a layer of sand on top of the soil or is that bad for them? sorry for all the questions Im just a little curious and I dont know anyone who has owned a chameleon.