Got this off wiki ( I know its not always accurate) but still scary...
"His zoanthid was found to contain 2-3 milligram of palytoxin per gram.
[9] For comparison, the intravenous LD50 dose of palytoxin for a grown man is less than 8 microgram. Thus each gram of the offending zoanthid contained enough venom to kill at least 125 grown men."