I currently keep 1/2lb of blackworms max in shoeboxes. I have the room to keep 3-4 shoeboxes full in my fridge. Any tips on increasing the reproduction rate? I rinse with greenwater minimum once a week, and cover them with greenwater. Die off is minimal. This group of worms is from around December so they are certainly surviving. I am thinking my reproduction is on par, but now I need to fatten them. Any tips on how to fatten them. Will fish food help that much. My guys love the blackworms but I am not going to feed them for 3-4 weeks. Just to give my blackworms a rest.