So what you are saying if I'm reading correctly is that you had nitrate and phosphate issues, and these are what fueled your algae problem. If you started an aquarium in October, I would imagine your tank went through the same ugly stage as every tank on the planet. It's a normal thing to have a diatom bloom come pretty quickly and then disappear once it's food source is depleted.
Something like this happening a year in is a different story. Overfeeding and insufficient nutrient export is usually the culprit, but it can also be brought on by poor source water, impurities in your salt mix... etc.
light is not going to help with this.
Phosphate and nitrate reducing media may remove the symptoms of the issue, but I suggest correcting the problem instead of just being happy with zeroes on your test kits. A healthy tank has no need of nitrate/phosphate reducing media.