A year and half ago I completely cleaned out a pond and some weeds grew back in the dirt on the sides whcich made awesome habitat for FHM and Golden shiners right now the water itself is very green no green stuff on top just in the water itself are super small green particles making the water bright green is this a good aglae bloom? Will this kill the fish. I seen lots of small FHM minnows swimming on the top and edge like it didnt bother them.