I just picked up a copperband a week ago. It turned down live black worms, brine (frozen and live), and mysis. I then feed clam and it was the first time it ate after having it for 3 days. I then mixed brine in with clam, now it eats brine alone. I then mixed mysis with clam and not eats mysis alone. So you would think it also eats live black worms because i mixed the worms with clam, nope still will not touch black worms lol. I love feeding black worms and i will not give up until it eats them. Maybe once out of qt and in the DT it will eat worms when it sees all the other fish going crazy for the worms.