If you get into African Nightcrawlers at all, from what I've been told by other worm farmers, is that they like a lot of "outdoor" materials. I give mine all the "reject" leaf litter that I make in the fall. It all gets baked in the oven prior to giving it to the worms.

I've also bought "C-Clamps" to place around the lids of my tubs for my African Nightcrawlers as well. These guys are "bad worms" IMO. I've tried duct taping the lid shut, they got out. The light is only a mild deterrent for them. African Nightcrawlers do not like to be disturbed, it will make them crazy for days to weeks when they do. I started culturing mine almost a year ago now, and they've only just started to calm down.
I bet I lost at least half the worms I started with, in the first month that I bought them, just from them escaping the tubs. When worms escape, they usually die within 2-3 feet of the worm tub, they dehydrate quickly.

One thing I was told, is if you have a roach or cricket tub (or other insect), you can put the used egg cartons from that tub into your worm tub for them to consume. Don't do this. You could end up crashing your worm colony.

Used Coffee grounds/filters and used tea bags are also a favourite for worms to eat.