I'm going to have rams, checkerboard chiclids, a goby, and a couple of darters for my bottom-dwelling fish. Do you think they'd get all the blackworms? I've never seen any of them dig.
Hmm... I have a female betta who doesn't quite know when to stop eating, do you suppose she'd eat herself to death on blackworms? If not, I might as well try once the tank is all planted and leafed up. At best, I get a blackworm-populated tank and at worst, my fish get treats for a while.