How to "encourage" an anenome to split?

[Coralgurl]

Is there a way to do this? My RBTA which is more like a long tentacle nem is MASSIVE! I've been told to overfeed it, pour cold water on it, neither is working! Its gone from the size of a small coffee mug, to well massive. Its in my 55 and taking up some good real estate, its tentacles are so long, I can't keep anything around it, so wouldn't mind it being smaller. I don't want to move it to the 180 as its hosting my clowns, and my rbta in my 180 is finally doing really well and coloring up nicely, don't want to switch things up.

Such a crappy problem to have I know....