1. Wear gloves, wear goggles/glasses, and something to cover your mouth.
2. Blow some water over the zoas to have them close up while in the tank. Remove frag rack after all zoas are closed.
3. Take the rack out of the water and set it on a flat surface to work on. I like to work on a large towel to soak up any water.
4. Have a little bucket of tank water to put the zoas back into once removed
5. Use a combination of razor blades, exacto knives, bone cutters, tweezers, etc to get under the zoa chunks.
6. Clean the area well and your tools. wash the towel.
You can glue the polyps directly onto frag plugs or rock rubble in my experience. Good luck!