How to split my corals?

[AVVITT]

Hi guys. I bought a Kenya tree and toadstool from my lfs which were sharing a piece of rock. They've both since grown, especially the Kenya tree and they are sharing a space which is no way big enough.
The Kenya tree seems to be spreading up the back of the toadstool and hanging over the top of him stopping him from coming out so much and blocking light.
Not great pics but I'm thinking I need to get the Kenya tree moved but wanted the best way without damaging them both?

 

[monkeyCmonkeyDo]

Cut the kenya tree. Itll heal and grow back.
Place a rock on the frag and itll attach in a week or so.
D

 

[najer]

Can you get a chisel between them and split the rubble?

 

[AVVITT]

No, the Kenya tree is starting to grow up the back of the toadstool

 

[NeonRabbit221B]

Freeze some RODI into ice cubes. Press the ice into the base of the toadstool and pull just a bit. Might take a few minutes but eventually the toadstool will release without having to cut anything.