Hikari Vibra Bites are a completely safe live food alternative for tropical fish. It offers all the nutritional benefits of live food, such as proteins and amino acids, without the risk of parasites or bacteria. The worm-like sticks are a very slow sinking food which mimic wriggling bloodworms to attract your fish. Some fish will only feed in a specific temperature band to extract the most benefits from their food, the perfect water temperature for this food is 22-28 degrees C.