Too many anemones

[Dash]

Hi everyone...first time posting

I've read up on this but haven't had any success. Started with one rbta 10 months ago and now have 11. It's a bit too much of a good thing, I'm afraid. They're all on the original rock except for one who moved onto the adjoining one by like an inch. Any tricks for getting them off? I only have a 75 g so I'd love to get some real estate back. I don't want to break the rock as it's my fave.

Here's a pic of them before lights came on so you get an idea of the rock. They love all the crevices!

Thanks!
Maggie