What eats elephant ear corals?

Hi all,
At the risk of being flamed for wanting to rid my tank of what some
might call a beautiful coral, I would like to know the best way to RID
my tank of elephant ears. I bought a small piece of rock with metallic
green xenias and within a week a small elephant ears started to grow. A
couple of months later I have an infestation of elephant ears and no
metter how I try to clean the rock they grow on, I cant seem to get rid
of them peminantly and wondered if anyone knows of a 'reef safe' fish,
or invertibrate that will do the job for me? If anyone does have any
suggestions please let me know if the elephant ears are the only things
they eat.

Thanks all