razor bload under the mat i can remove hundreds of polyps without cutting any rock or damaging any z0os.
if no mat then use a diamond blade to cut from underneathe the rock , make channels left and right , up and down of about a 1/2" or %50 of the rock width.
use a flat top screw driver and insert it into one of the channels, twist the screw driver and wala......if any skin is attached use a sharp razor to cut the left over skin.
this is the best way with little damage to polyps.
ps....palytoxin is just that......."paly" toxin
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