I'm not sure, I mix the bone meal into the soil, as directed from a worm breeder I know, it aerates the soil. As for food... Once a week I add a couple pieces of veggie scraps or coffee grounds if we have the luxury of even having coffee, and quite a bit of the calcium, they eat that so fast it's not funny.

What are the signs of protein poisoning?
A couple of my worms turned to mush with white pus-like stuff around them with big red bumps all over them. I had checked them the night before and made sure they were all okay and to see if their food was gone, none of them had that problem. It was completely gross and smelt like it had been rotting for a month.