I have started to decrease the direct sunlight by not opening the shades until closer to 10am. I have a direct east facing window, so I'm thinking that is a little too much sun as well. The exposure time hasn't increased in the last month or so either. The algae growth really started in the last month. I should also mention that July was one of the hottest months so opening my shades may have been a contributing factor. As a side note, I just got home and checked the salinity. It is back into normal range of 1.024 as well. No algae growth on the glass like I had been noticing and cleaning everyday.