My new ornate and delhezi immediately went nuts over blackworms (my ornate is very shy, and so far thats the only thing he has eaten). Every fish I have (including the senegalus, my first bichir) love the worms, and you can throw a bunch in and let the fish pick at it. Blackworms are a pain to keep; I clean them every other day, and use a pipette to weed out the dead ones and leaches (I spend about 1 hour doing that everytime I get a new batch).