Live Blackworms (Lumbriculus variegatus) are a great treat for all aquarium fish and an excellent choice as an enticement food, especially for fish who are picky eaters, or hard to feed species like Peters Elephant Nose Fish, Rope Fish, Axolotls, and Discus. Blackworms are also ideal for acclimating wild fish and for acclimatizing fish stressed by transport, aggression, or illness. However, as with any live food, it is highly recommended to feed your fish a varied diet. Although uneaten Blackworms will not foul your aquarium water, do not feed any more than your fish will eat in about 15 minutes. Blackworms are packed full of proteins and are regularly used by breeders to maintain and condition tropical fish and other aquatic species. Even the finickiest marine fish will break their fast to chow down on these Live Blackworms!.