Get a fish trap. My lfs rented me one for 2 bucks a day. It has a sliding door on it which I had to hold up with monofilament until the fish went in after the bait, then simply let go of the line. The trap is made of clear acrylic. Just bait it with their favorite food and be patient. I caught a clown wrasse and a small trigger at the same time! I wanted to trade them both anyway!