Just a thought - IF we are running activated carbon, and have a LOT of water - the poison should be diluted MUCH more than the amount that Curt had to endure? As he actually fragged the zoanthids, and handled them with his hands, right?
Likely, yes... but still, it doesn't take much! This stuff is intensely toxic. Even with oodles of carbon and lots of water, I would still be very careful.