Desc: The Green Monster: It Came from the River: Directed by Ray Hays. With Jeff Lageman, Neil Armingeon, Shelley Danforth, Terry DelValle. In the summer 2005, the St. Johns River was taken over by a smelly, toxic algal bloom that turned the river green. It was the worst such bloom in the river's history, and was caused by an excess of nutrients in the water. One of the chief sources of these nutrients was fertilizer runoff, and this show teaches you how to fertilize properly and create a river-friendly yard.