So a couple of months on, here's the little fella now. He's now eating Brine Shrimp and Mysis Shrimp readily, although won't touch Krill. He gets a fresh Mussel every other day roughly, fed in the evening about half eleven when the lights are at their lowest, with just 1% blues on. Most of the other fish go to bed, whereas the copperband is somewhat nocturnal, so has no problem tucking into his Mussel at night.
Taken about 10 minutes ago: