I let Monty sit on the edge of the woodlice tub today so he could help himself to lunch! He really loves his woodlice! It's the only feeder that gets such an enthusiastic response form him! He lights up when he catches sight of a woodlouse, lol!
You can, but not too many. Check out sandrachameleon's blog on isopods and their care. I am waiting for them to breed, but they don't seem to be doing much!