In my experience it is generally not wise to frag zoas that are in a state of distress, unless you see a visible bacteria,etc. and you are trying to save the colony. Any time you frag, you create stress on the coral to various degrees. Zoas are hearty corals, but with any coral it is a crapshoot as to your success. That being said, I have fragged many colonies with very limited losses. Polyps that grow individually in the rock are a lower risk. Polyps that grow in a common mat and have to be cut away and/or scraped off the rock are a much higher risk.
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