Algae in my hydroponic system :(
Hello everyone, I need advice on how to get rid of algae in my hydroponic system as well as making it hopefully stay gone. My setup is pretty simple its made of pvc pipes, metal, 100W grow lights, foam boards for planting and of course the filters and tank. My ph for the system fluctuates sometimes it's around 6, and other times its around 7, I'm also not sure how to control that. I've replaced my filters many times as well as completely cleaned the system but it still comes back, if anybody has any tips they would be greatly appreciated!