I use cypress w/ my female, and I have reptibark w/ the male. You know I never would have thought of that, that definitely could be it. I just switched to cypress and I love it,it keeps humidity so well. I just have the male on reptibark bc I just had a little bit left in the bag and didn't wanna waste it. Funny thing is he likes to hide under his water bowl,but he's gotten a little chunkier so i know the weight of the water bowl is squishing him on top of the reptibark. Thanks!