In your case - it is the among the first introduced to your tank - it means that is not so much competition at feeding time. Also - if it is pre QT at Dr Reef´s facility - it must already eat frozen food. Just ask what he feeds with.
Natural feeding behavior of a copperband
Not so natural feeding behaviour of the same copperband - it is eating freshwater copepods
Sincerely Lasse
I think that this is a very important advise and be sure that he/she have hiddingplaces too. With this type of fish I would be careful to have it in a QT tank for a too long period - especially if it can´t behave naturally in the QT tank. I would take some of the stones from the DT - put it in the QT tank and do a daily WC from the DT into the QT tank and move it over as soon as possible. The WC is because I have notice that it is much easier to adapt a newcomer to an existing tank if they have gone in the same water for a while ( I have done test that indicate that the smell of the fishes have importance for level of acceptances) If it is not accepted by your clowns - they will stress the copperband. If they accept the copperband - their feeding behavior will help get the newcomer to eat too (IMO). If the clowns had not already been there - I would have ad the pre QT copperband directly to the DT.They're shy and somewhat skittish, especially early on, so make sure there is sufficient ways to break line of sight with you outside the tank.
Natural feeding behavior of a copperband
Not so natural feeding behaviour of the same copperband - it is eating freshwater copepods
Sincerely Lasse