Latestarter,
Congrats! If you find that mold starts growing, I would get rid of the sponge. You will soon figure out how much carrot, etc they will eat in a day. Then it will just be a matter of feeding them the same amount every day til they pupate. Have fun!
Thanks Sue
I live in high plains (almost desert) conditions here on the front range in Colorado... I'll keep a close eye on it and if it seems too moist or I think mold is developing, the sponge will come out. I check them several times a day (hey, I can't help it... I'm nosy!)... in the early AM before work, as soon as I get home, and before I go to bed... I'm sure the thrill/entertainment value will wear off shortly LOL. There were already pupae in there when I dumped them out and just in one day, the number seems to have doubled... I'm eagerly awaiting my first beetle!
Tried opening the bottom one since it doesn't have screen on it with the one above it and then trying to close them at the same time is a little hard to do. Mine is a small one so I can only imagine the larger ones. I think I am going to just use plastic shoe boxes and leave them in place and not separate them all out. If I keep them veggies in there they shouldn't eat each other. 
