I had a bit of trouble in the beginning, with meal moths but in the end they done really well. I've had them for over a years now, I recently got a few hundred more to mix up the breeding but other than that a new apple slice every three or four days and they do really well. I have hundreds of beetles, 20-30 new a day now that it warmer. Thousands of mealworms or all sizes, looking at getting a bigger container for them. Just put a tone of the larger ones in the fridge. Bedding is just all natural oats and bran.