Most tropical fish will not turn down ProSalt Blood Worms; our Bloodworms are sterilized at time of packaging. Blood worms should be used in rotation with other foods. Our Blood worms are great for Betas, Angels, Discus, Killifish, Livebearers, as well as marine fish such as Moonfish, Slipmouths, Pomfrets, Drums, Goatfish, Monos, Sweepers, Marine Angels, Hawkfish, Butterflies, Blennies, and some Tangs.