I finally (I had to order them) got the 50/50's out and replaced them with 10K's - Wow! The difference on even 2 x 18 watts is amazing.
Today I also turned the Co2 bpm up to 120 - 130 (double what it was).
I will monitor closely over the next few days my ppm - it was only 9 yesterday (and the plants look pretty good). Can't wait to see them with the improvements.
I am also dosing with ferts on a strict schedule - we'll see what happens!