I know this is an old article, but wondering if there have been these types of problems associated with the seaweed SXM has been seeing lately. Carol, I apologize if I'm not supposed to link this. You can delete it if I'm violating any copyright rules by posting the link. Again, please note this article is from 2011.

http://www.todaysxm.com/2011/08/10/seaweed-emits-poisonous-hydrogen-sulfide-beach-closures-possible/

Robin & Ed

One’s destination is never a place, but a new way of seeing things. - Henry Miller