well for some reason my yellow star polyps have pretty much completly died off. all the water perameters are fine and everything else in my tank it thriving. but the polyps started to turn kinda dark and then they would open up "to far". I say to far cause the center of the polyps would turn into a dome shape and then the tenticals would poind down to the base. then a day after they did that they would not open and the tenticals would turn a bright yellow. then they would never open again and they just rot away. any ideas? and I will post pics.