coarl

i was given this coral about a month ago and I have no idea what it is can anyone ID it?

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...