couple things to try.
-Might be the RO water. there are no minerals in it. try running tap water with some water conditioner, and see how that works.
-Cut back on the Co2 to like 2 - 3 bubbles per sec.
-Make sure the color temp of your lights is in the 6000 - 8000k range
-You may want to cut back your lights to 6 hrs per day, to get that algae under control. Do some water changes and get rid of as much as you can.
That's all I can think of off the top of my head with what you have provided. Just try different things. you will eventually find the balance. I took me 13 months to find a balance in my 90 gal. don't give up!