I have a button colony in one of my reefs and they suddenly closed up. They have been closed for about 3 weeks. Water quality is 100% okay and the nitrates are at 0. I have a plate, frogspawn,waving hand, and a maxima. The clean up crew is 3 blue tip, 3 red tip,and 3 orange tip. The tank also has 3 asterea conehead snalis and 20 brittle stars that were on the zoa's when I bought them. The zoa's were fine when I bought them but now I think their dead.