Or get a fish trap and put rocks from your sump in the trap (wrasses love new rocks so they can hunt)...or actual fish food, but food never really works for me. Be very patient with the trap as it might take a while....maybe even place the open trap in the tank for a day or two so the fish become accustomed to the trap in the tank and they are not shy when it is near them....then place rock from you sump in the trap and go fish.