How to contain these corals...?

[hummer]

I bought a pulsing xenia, green star polyp and Kenya Tree when I first started my 90G 5 months ago. The xenia has split from 1 branch to 5 branches. Green star polyp has grown about 3" in diameter on a very large rock. Kenya Tree has tripled in size (about 4" tall) and has been dropping branches everywhere. I didn't think about them growing out of control at the time. Is there anything people do to control them from spreading?

Thanks!