> Red tide, a pesky phenomenon that is rare for Floridas eastern shore, has rolled into the Treasure Coast like a rude Thanksgiving guest, giving beachgoers in four counties tickly throats, itchy noses and eyes and killing fish in some coastal waters. We were sitting around the pool yesterday and everybody was coughing, said Becky Cowin, an Indiana resident visiting relatives on Hutchinson Island. We kept asking is this anthrax or what? Nobody had ever heard of red tide. Red tide is caused by microscopic plant-like organisms that bloom and release a toxin into the water. Depending on how concentrated...