Funnily enough, I was doing the Low Light EI dosing regimen outlined on Rotal Butterfly in the beginning, for the first 7 or 8 months this tank was set up. Since stopping, I have noticed no discernible difference in plant growth, so they're likely getting all they need from the dirt under the sand. There may be less algae, but there's not that much in this tank anyway. Just a mild amount of GSA...except for the anubias. I've never been able to keep anubias algae free and pretty in greater than ~30 PAR (using a Seneye).
I love the look of anubias but they are the bane of my existence when it comes to algae...
If you can stomach snails (red Ramshorns are nice - IMO), they might take care of your algae problem.