I am so sorry, doesn't sound like you did anything wrong, sometimes this just happens and there is no explanation.

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You must use a thermometer......you can not guess the temperature with you hand.I had them in a vivarium, which has 3 vents in it. The temperature felt fine, I did keep a thermometer under the Ecoglow at first but took it out when they were pooping it was about 32celcius under there. I also dried them with a towel after they had bathed before putting them back. I really loved them xx