So it happened.. My purple nudi died, and being poisonous I took it out pretty quick... and did a water change at the same time. like 30%... My water levels are normal and cool. BUT my a few zoas and Polyps closed up cuz of maybe the poison or whatever... and haven't opened back up in 4 days... They look fine, like they aren't dying... but wont open.. Anything I can do/feed to help them recover, besides never getting a coloring looking thing like that ever again?