Quote:
No, you don't need to drill additional holes.  There is space between the drawers and there are no seals so it's fine.
Quote:
Yea, they do the head-in-the-sand even when they are growing and shedding the exoskeleton.  Don't know that there's an absolute perfect set up for success.  Being insects, they will thrive in any container as long as they are dry and warm.  I've actually gone to smaller containers for the beetles having the screen on the bottom for the eggs/wee wormies to fall through.
Check out the pictures on my mealworm page and Gallo's page.  He's had success with a colony all in one 10 gal aquarium.
Glad you're having fun!