Anyone who kept discus and angels through the early and mid 2000s, pre-blackworm craze, knows that Hikari bloodworms are a perfectly good food. We discus hobbyists bought the huge flat packs 10 at a time. I fed bloodworms as a staple to discus, angels, rams, Uaru, and every other small and medium sized cichlid I raised, from small fry to adult size. My fish were healthy, sturdy, and bred like crazy. People can argue numbers all they want but the proof is always in your fish. ¯\_(ツ)_/¯ It was always news to me when people started trashing them because so many thousands of people were using them with great success in the discus hobby.
