I just captured a blue flasher out of a 120 and it took me all of about three minutes. I have a large plastic bag, like the ones fish come in. I weaved one end of a fishing line around the opening. Then tied a slip knot. Placed a small rock in the bag to hold it down. Placed it in the tank, and added some food. Took the other end of the fishing line to the couch, relaxed, and watched the tank. When the wrasse went in the bag to get the food, a quick tug on the line closed the bag with the fish inside. This is the quickest and easiest way I know of to capture fish in a reef.