Well, there is good news . Your photo period is too long. Reduce the photo period, or intruduce a "black out" in the middle of the day for a couple of hours and the algae should go away. You may just have way too much light for this type of tank. You can basically grow those anubias with ANY type of light, even if it was a very low wattage one. So, either dim the lights, introduce a black out, or shorten your photo period by at least 3 hrs.
Co2 is a game changer for people that want to go fully planted. You do not have enough plants to justify the upkeep cost of co2. If you plan on fully planting the tank, then go ahead an invest. If not, try the alternatives I gave you.
Lastly, you can invest a few bucks with DIY co2. I personally don't think you'd benefit from it, but it is also an option.
check out this vid by one of our members here:
https://www.youtube.com/watch?v=1JzvfHO31Ug