Green Algae on substrate

Hey Guys,

I just did a test on my phosphates and I have measured it at .40, I am going to make sure my skimmer is working properly, I put in some phosphate remover called phoslock, and I have reduced my feeding to one time a week. I also move my powerheads in a way that water is keeping detrius in the water column. Are there any other things that I should be besides what I just outlined above, any ideas are appreciated, thanks again.