My very first batch of corals 3 years ago included a 2” diameter green fungia plate. I had a heater malfunction in my QT which I didn’t catch for a week and the water was at 55of in between weekly water changes. It lost all its flesh and turned completely white in a matter of another week
I put it in my display anyway. Kinda hidden away but just sitting in the sand. 2 1/2 years later, I now have 37 fungia plates of various sizes, spawning off the original ‘dead’ skeleton
don’t throw out your dead corals, people.