I would try the krill in the net idea first.
I've caught a Sixline Wrasse, Hawkfish and a CB Angelfish by leaving a net in the tank until they're not freaked out by it. Basically I sit the net in the tank so its a bit away from the front glass (so a gap is left and the fish can swim between the front glass and the net), and leave it there for a day or two. Next day I put the fishes favourite food in (or in front of) of the net (without moving the net) and wait. It might take a little while but usually they'll just swim in and around the net, because they've got used to it being there, and try and get the food.