So i'm going today to get a tank and some misc. stuff my son will need for his crestie. My question is I have a bag of cypress mulch and a bag of sphagnum moss left over from when my BP's where in tanks. Could I use one of those as a substrate for his crestie? If so which would be best? I've read a few care sheets and some say they are good, some say they are bad Also i'm looking into one of those exo-terra tanks, how are those for holding heat and humidity?