This thing is enormous

[Geofrog]

Does anyone know how big Sebae anemones grow to. I should have researched it more before I got one. Mine sits right in the middle at the front of my tank and has grown to be about 12" across and the foot is about 4". The tenticles are starting to sting some of my corals, so I have been moving the corals around but even after I move then the anemone seems to grow larger just so it could torment my corals.

I don't really want to get rid of it as my clowns just love it in there, but if it keeps growing, I just might have to give it up.