Check out the "Copperband Primer" - a lot of good suggestions there. By best I assume you mean something that he will eat. You might try frozen blood worms, different types of frozen mysis, and frozen brine. Mine will only eat frozen or live
- not flake/pellet. If you have any tube worms, he will almost certainly eat those, and they would be good for him. Maybe take a rock from your sump that has some on it if you have some there but not in your DT. Good luck, and check out the primer.