okay, i dont use any substrate for my 2 cresteds, and this seems to work alright. I am just REALLY nervous about substrates. At the beginning of my herp endeavor I bought 3 leapord geckos and used the sand they sell at the PETCOs and lost all 3 of the to gut impact. I hated watching them die and I dont want to lose any more geckos so PLEASE HELP





