Full sps reef, how to catch a powder blue?

[Ya Dude]

ive caught fish before by feeding all the fish with a net.Put the food in the net and clamp it to the side and leave the room.keep the net in the tank always with a clamp so the fish get used to it.after a week feed the fish holding the net till theyre comfortable and just pick and chose the one you want.Ive dun it