I have an anenome that is getting out of control and taking over, it has split into 3 or 4 anenomes and each piece is at least 6-8" in diameter. I would like to get two seperated so I can sell them. They are located within a group of rocks. I have tried to gently remove them by hand but their foot is down in the cracks of the rocks and doesnt want to let go. Is there a secret to coerce it away from the rocks?