There is one palythoa that is particularly obnoxious, a sea mat sort. Sundisk or palythoa heliodiscus and its relatives are the worst, apparently, They have pale tentacles pale spots, or pale stripes. Zooanthids may share the characteristic, but few are anywhere near as bad. Wear xeam gloves, dis pose of the water you dump quickly and rinse containers. And do not let yur dog or cat sample the waste water, or gloves you've been using. Wash your own hands, and you might also wear glasses or goggles when doing work that could splash in your face. There are ample articles on the interwebs. Google palythoa toxicity or palythoa poisoning.