I've never chipped Zoas, only cut below them with a sharp razor blade trying to get as much of the hard layer under them as possible. As a precaution, I also wear a jump suit, face shield, and rubber gloves which I will tighten with rubber bands around the wrists. (I'm really paranoid about the Zoas and hate cutting them.) I do this in the laundry room and when I am finished the clothes I'm wearing go directly into the wash. No sense taking the chance and walking around wearing the juices. The juices look like tobacco juices and are very dangerous. I have heard that 1 drop can kill up to as many as 160 healthy adult men. Not sure if this is an accurate number but I don't want to find out either. Even with gloves, be sure to wash your hands. When I cut my Devils Hand, I take it out of the tank as they will release juices when cut that will get into the water. I have never noticed mine to get very much smaller, if any, after the cuttings. I choose to do a couple in one area, an area that will allow me to put it facing the back of the tank so the best side is facing foreward. They will heal pretty quick, about a month or so you will notice that there is another finger sticking out that is smaller but is healing nicely. When finished with the fragging, I put 3 or 4 drops of Iodine in a separate container of water which will not only aid in healing but will also clean off the juices excreted from the cuttings. I do this with all my frags. Good luck and don't forget the pics.