From personal experience with the Ray2 and not using CO2/Ferts. It certainly is high light and I had to elevate it above my tank and shorten the time I run it to 8 hours to counter algae outbreaks. =P
It is that sort of high light algae growth that I am trying to avoid. I always have to resist the urge to blast my tanks with ridiculous amounts of light. I just need to remember that more isn't always better. It does sound like you got the problem under control. Are you happy with how the color looks with the 7K?