today as I did my 15 gal water change, I took all my rock out scrubed it with a toothbrush, with my old water. Got as much of the loose alage out as I took water out. Tomorrow I will test water. There is still small amount of alage on rocks will keep eye on how fast it starts to grow. If anyone can throw some tips my way it would be helpful. Also cleaned power heads,turned lights down one hour.