Ok, so I did the oclt. Fc was 2.0 at 5pm, I checked it again at 9pm @1.0, and just now at 1.5, so I would say there isn't an algae problem. As for why am I not supplementing, I will, but I shouldn't have to. When the pool was new, a swg setting of 95% would put the fc at 8.5-9.0 @90 degrees. Now...