My 75 reef is currently experiencing some time of green algae. It's not hair algae, it's a small green string algae that is on the rocks in places. I'm also getting a bit of cyano. Total maybe a 3"x3" patch of it all together throughout my tank. What can I do to get rid of all these algaes? I do use ro water. Note RO, not RO/DI. Also, I don't have a phosphate test kit so i'm not sure what it's at. As far as everything else is concerned, i'm looking great. What to do?