We had ours a total of two weeks. We have metal hallides and great water quality. The first few days it opened like at the store, then it stopped extending all the way. I thought it might be light so moved it lower in the tank. It started to lose its polyps after 7 days and was a total slime ball after 10 so we moved it to a qt
tank hoping to save it without an ammonia spike. Needless to say it turned into a brown and white mass of sludge and I finally threw it away at day 14. We had the right lighting, a mature system with many corals and inverts and did a longer than usual acclimation and it made no difference. They are simply not for the aquarium. Good luck with yours but keep an eye open for ammonia problems.