coarl

Anybody have any suggestions on what's happening it seems to be melting over night all other corals are perfectly fine had this coral for a year

I’ve had a 120 gallon saltwater Aquarium for about 8 years. At the start of last weekend certain corals including a large number of green mushrooms and 2 frogspawn corals shriveled up and have not opened since. Other corals seem fine, including a different type of mushroom. No variable have...