Same here i have a 10+" gorgeous elephant ear which has never attempted to eat any fish in my tank. I have lots of fishes that will sit on it, hang around it and what not and it has never once closed up to eat them or open its mouth. I have tried to feed it misis and it has never taken any interest to it.
If you have these Elephant ears under LED's it will get a gorgeous green neon body with purple polyp.
I keep mine in the sand bed and only gave it a small rock for it to attach. This will avoid giving the coral knowledge that it could split and spread since it has surface to attach. During the day it crunches it self together to look as if it was a wave, open brain coral, toad stool wavy base lol lol.
Overal awesome coral.