i read that if they lose their pom pom they can get more from other pom poms. when the anemone gets big the pom pom will frag it and throw some away and another pom pom will pick it up if needed. same is true if they lose only one, they will frag the one on the remaining claw and transfer it tothe empty claw. cool!
the anemones they use are specialised i think. you may need to add another pom pom with the proper sp. of anemone.