Crazycatlady, i dont think you need to worry, from what i understand, its leaving them in overnight when there could be a problem.
Also, yes, from what i understand from others on here, you dont have to feed them crickets (phew) they will do just fine on locusts and other things you can feed them like dubias, mealies, worms etc along with their fruit & veg. Variety is the key.
Im a newbie myself so if anyone wants to add anything or correct me, please feel free i will not be offended, i am still very much learning myself.
Mum to 3 kids, 1 dog, 1 rabbit, 12 chickens and now 1 lovely bearded dragon Dudley