I have a beautiful pair of crested geckos and would LOVE to have babies from them! She's a blood red and he is a yellow/dark orange/brown color. He is younger than her, but they have been have a 'good time' and she has laid eggs. Their habitat is everything they possibly need, they're healthy and just plain awesome all around, even in behavior. However, since her first hatch of two eggs, she has only laid one egg at a time. I was not prepaired for it so only recently placed a nesting box in the cage. The single eggs have not been viable, I can see she has only one egg in her again. I know not having the nesting box could affect this, which is why I placed one in asap so she does not begin to have complications. Could this be because the male is still too young? Or is it still too soon to tell with the nesting box being a new thing? (say like, a month?)

Thank you!