you can try to grow your polyps on LR rubble. then when you get a few polyps on each peice of rubble, you can then relocate the piece of rubble with the polyps on it.
yes you can break some off and transplant them, but instead of breaking them, you can cut them. you cant really break the polyp, but you can break the rock they're on. just be carefull because they're toxic. what kind of polyps do you have?