Hey I'm getting some green spot algae over a few plants. I need to know
how much to fertilize. I have removed some lighting because I couldn't
keep up a stable environment (I had 4wpg). I now have a more manageable
2.67wpg @ 10hrs per day, 15 gallon wide tank, 25-28ppm CO2, doing 50%
water changes weekly, adding 3-4ml traces and rice grain of phosphate and
1/8 tsp potassium nitrate biweekly. Should I be fertilizing more or less?

I see GSA in my aquarium in 2 ways.
1.To high mikronutrients(fe mainly).
2.To low Po4 ant additinaly to high NO3(not used).
I think You add too high mikro if You add daily.