I have always heard to frag zoas in a separate container of tank water, or just in open air (my preferred method... lazy

). I have also talked to people who say if u get the zoo goo in an open wound it can be major problems (even rumored death in some cases), and know a guy who rubbed his eyes after fragging and his eye was enflamed for about 2 weeks. Wash your hands and be conscious!
...but I still just pull the colony/frag out of the water, knife it off, and stick it where i want with a cap for no flow. Then wash hands... a few times...
What doesn't kill you makes you stronger!!!