I have a 65g tank. 36x18x24... I am running 2 t5ho bulbs about 4 inches off the surface and 25 inches from the substrate. Not sure what kind of light this gives me..high or medium?? I am in a battle with some GSA. I have raised my co2 to the max and my po4 is above 10 as far as I can tell. Is my light to strong? Can I raise it more and solve the issue. It seems like the algae only grows from the middle of the tank down. Where the waterline is after a water change...and only on my anubis and large rocks, very little on my glass.