Welcome to the Planted Tank! I moved this to the low tech section, might be better suited.
I noticed your comment
There are a couple of threads about low light plants in this low tech section, like this one.
I noticed your comment
Adding CO2 does not require more wattage, it's the other way around, with a certain light level CO2 is required. Your tank is borderline... 2 W/gal for a large tank like that might be easier to handle with CO2 injection, not sure.
There are a couple of threads about low light plants in this low tech section, like this one.