What corruption said.

Also, torch/hammer/frogspawn and bubble corals seem to "like" an iodine dip when feeling bad. They will sometimes get overrun with pests (usually planaria), and not open. As I recall, 4 or 5 drops of Lugols in a liter of tank water for 10-15 minutes. With this weather, try and keep the water the same temp. Do NOT further damage the heads.