Quote Originally Posted by Stewart_Reptiles View Post
Considering it is 4 clutches and no one random one, this is definitely an issue with the incubation process, and usually the most likely culprit are temperatures especially fluctuation which sometime go unnoticed if they happen for a short period of time and or overnight and when you incubate at 90 you have very little room to allow for that.

Some heat spikes will not affect hatchling but this depends on which stage of development the animals are in.

88 - 88.5 is usually a good number to incubate at 86 is feasible but again you are falling in the very low end and be better off to incubate in the middle between 86 and 90.
Thank you very much! Yes, we will try at 88F next time. My boyfriend's mentor advised him to incubate at 90F when he was starting out (and he himself did 90F), and he's never had issues until now. But we were using homemade mini fridge incubators, which I imagine are much better insulated against fluctuations. (And in all honesty, over the years of our own learning and experience, we started to question some of the practices of his mentor and advice he gave... He seemed to care a lot less about his animals than he said he did... It doesn't surprise me at all to hear that 90F is riskier)

Thank you again!!