I've been trying to research it for you and came up w/this:
[URL="http/www.sciencemag.org/cgi/content/abstract/172/3982/495"]http/www.sciencemag.org/cgi/content/abstract/172/3982/495[/URL]
"Palytoxin: A New Marine Toxin from a Coelenterate
Richard E. Moore 1 and Paul J. Scheuer 1
1 Department of Chemistry, University of Hawaii, Honolulu 96822
Palytoxin has been isolated from the zoanthids "limu-make-o-Hana" (Tentatively identified as Palythoa sp.) as a noncrystalline, chromatographically pure entity. Apart from polypeptide and protein toxins, it is
the most highly toxic substance known, with a lethal dose (LD59) in mice of 0.15 microgram per kilogram by intravenous injection. Unlike the potent toxins batrachotoxin, saxitoxin, and tetrodotoxin which have molecular weights of 500 or less, palytoxin has an estimated molecular weight of 3300 and contains no repetitive amino acid or sugar units."
In other readings I only see limu make o hana listed as well. When I get my tank up and running, I'll have some special gloves that I'll wear for messing w/my sw tank when I have to reach in. I think it's better to be precautionary.
I've heard of people getting stung by them and then say their hand burns or feels weird for awhile,but I've never heard of any grave side effects.