First off I must say I have tried several different substrates for cresteds, and it always goes back to good ole' paper towels. I did the whole planted tank, and it looked beautiful, however, it was a PAIN to find the eggs! So now what we do is use a paper towel substrate, and just put in potted plants! The catch is we cut out needlepoint screen to the same size as the pot and put it on top of the soil and then put some sphagnum moss on top of that to make it look nice! I have had a pair of eggs buried in here once, other than that it's always in the nest box.
As far as perilite causing cancer, I have NEVER heard of that. I also haven't heard of that many people having success incubating on potting soil. Most people use vermiculite, perilite, or a mixture of the two! As far as the cancer goes, I know they have shut down a VERMICULITE manufacturing plant for finding asbestos. That is the only thing I can think of even close to that.
About cresties not being arboreal except at night!! HUH, I must have had some weird cresteds in the past, and currently. LOL I rarely see them on the ground. If so it usually means eggs are soon to follow! I have 1.3 in a vertical 40 gallon breeder, and can honestly say they are on the ground MAYBE 5% of the time!
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MIKE
4.14 Leopards (SHTCT, and Jungle Albino Trempers)
2.13 Fat Tails (Amels, Hets, and Normals)
1.1 Teratolepis Fasciata
1.3 Crested geckos
0.0.3 Dendrobates Tinctorius (Citronellas)
1.0 Diamond Back Terrapin
14 Snakes (Tri colored hogs, subocs, alterna, rosy boas, and black milks)