Good question! The bloodworm is a larval form of a midge fly and apparently eats microrganisms found in waste water treatment plants and mud bottomed ponds. They would probably not feed on each other, but the bloodworms will eventually become midges. Are you sure you want those flying all over your house? :kira:
I don't know about Brine Shrimp, but my Ghost shrimp are quite fond of frozen bloodworms and will balance on the end of a plant at feeding time to try and catch some.
