It looks like staghorn. I also had issues when switching to EI. Just make sure your nitrate, phosphate and potassium is truly what you think it is at EVERY DAY for a couple weeks until you get the hang of it. For instance, my phosphate was much lower than it should have been, and my nitrates were way higher due to my fish. You have to measure.
Honestly, I'm still figuring everything out but I have algae at a slow rate with 20-40 ppm nitrate and 2-5ppm phosphate. I dose before the lights and co2 come on every day if needed.
I've noticed that micros with iron (CSM + B) tended to cause staghorn algae when I overdosed on iron as well. Get a hanna iron tester.