I know I am coming in late here but I have that fixture on my 55 and let me tell you, it is a bear to keep that thing balanced. I was running two 2-liter DIY CO2
for years but I could just not keep up. I am now running pressurized and I have to watch that tank like a hawk - dosing something daily or every other day, so be prepared. You can very easily have an algae swamp and a bunch of smothered plants.
If you are experienced and are ready to upgrade, then go for it - but if this is your first planted tank, or your first hight light CO2
experience, then you might want to keep things in the 2.5wpg range if possible.