Since your Copperband is already eating Mysis, Plankton and the fresh clam you are giving it a good source of nutrition. I would not be overly concerned that it is not eating bloodworms. I could be that the fresh clams and Mysis and Plankton taste better to the fish than the bloodworms.
The main concern is for newly arrived fish that are not eating at all. Then I would offer them frozen bloodworms or live if available. Once the fish starts to eat in captivity it can be eventually trained to accept other foods.
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