Make sure the zoas do not have the eggs on their stalks. You can notice them by the circular pattern near the head of the zoa when it is closed up. They are pretty small so you will have to look close. If they do have them, dip them in RO water and gently scrape them off with a needle or toothpick. Don't poke them, just brush the needle or toothpick sideways so that they loosen up and fall. Oh yeah, make sure and wear protective eyewear and gloves when you do this. (Palytoxins)