not sure about phosphates, but lights go in 1 set 11:45 am and off at 9:30pm and the other is on at 2:00pm and off at 10:45pm temp is about 76.5 at night and 78-79 during the day.what are your phosphate levels, lighting duration, and tank temp.? I wouldn't say two or three days is really bad, but it could be better. I use my mag float once a week.
bill