I thought the image was enough for algae ID, but I can easily give more information!
30 gallon tank, with no CO2, dual T5 21 watt lights on for 7 hours with a 21 inch LED strip running for 3 hours. The tank is over a year old and the water levels are all normal except for nitrates, which are quite high around 60-80 (the test kit is not calibrated though). I do a PWC of 30% once weekly. I am fertilizing using a standard PPS-Pro recipe.