I've had a mealworm bin going for quite some time now and I do not see much progress. I've had one good haul but have since not pulled any additional. I've heard apples are a good food source, but I've also heard that apples add too much moisture to the bin. So, I feed our mealworms carrots. They crawl all over the carrots and devour them! What I'm looking for is tips or tricks to grow more. It has been, at least, six months of attempt. Any suggestions? I add carrots every 3-4 days. What else should I being doing? Singing them lullaby songs at night? Thanks for any help you can provide!