bag trick works for EVERYONE i personally know that have tried it. as long as no clams or non hardy corals are in tank, completely cover the tank with garbage bags. top, sides, all of it so NO sun light hits it. then, do not turn the light on, or feed them for 3 days straight. leave it pitch black for 3 days. after 3 days, remove the bags, and let the tank sit a little. then slowly slowly slowly introduce light back into the system so no corals are stressed with too much light in one shot. after that, do a few doses with special blend. works wonders for everyone. i personally am dealing with cyno, but cannot bag it because i have a few clams and other non hardy corals that NEED light, so i just wrapped it for 1 1/2 days, and it killed 75%. the rest i sucked out and its about 90% gone now...