Hi GermanDude ~
Yes, many folks at Geckos Unlimited think our website is
excellent. Thanks for choosing it

!
I have "bred"
Lepidodactylus lugubris since 1988. Well, actually, it does not take much. They do most the work

.
You've done good to separate them, because the mom will eat her children if given the chance

.
31 C seems too warm to me. I recommend keeping adults and hatchlings about 25 C. They will actually hatch and develop at 20 C on up with no problem, maybe only somewhat more slowly.
Are you lightly dusting your hatchling and adult with a
phosphorous-free calcium powder with D3? I like the Rep-Cal brand. I also use Herptivite (Rep-Cal vitamins) about 2x per month. If you don't do that, they will develop seizures which ultimately will prove fatal.
Sometimes I mix peach and chicken baby food into the banana baby food. They will also eat Repashy's Meal Replacement Powder.
I raise the youngsters on lightly dusted fruit flies until they will take 2 wo crickets.