Kathy Orr/Baker City Herald
James AhHee, a student at Eagle Cap innovative high school in Baker City, measures water quality. He is learning how to test for ammonia, nitrite and nitrate levels in the filtering system that will supply nutrients to plants. Ammonia is the waste product of the fish. Nitrite is toxic to the fish. Bacteria that is on mesh screens in the tank converts it to nitrates which are used to fill sweet basil plants.