Update on my experience with the Copperband ...
It has started eating frozen mysis put in .. (must be hungry). There seems to be less pecking at the LPS .. but I am still waiting to see it will eat the aiptasia! I think the Copperband coming from a Fish-Only tank to a mixed reef suddenly gave it "permission" to eat anything in sight .. like a starving child in a candy store! Hehe.
Well, hope this will eventually work out ... fingers crossed!