I was waiting to reply to see if I was making any progress with all your suggestions. So far, it hasn't gotten better, BUT it isn't getting worse.
@Fish Folk I have left the light level alone, but I did go back to my original fertilizing schedule and made sure to have the right amount of Nitrate. This is my first time really having to work at balancing a planted tank, so I was just trying out the most common solutions lol. I didn't block off the blue lights because they aren't in a nice row that would be easy to do. I did stumble on another post you replied to that had a link to some info on algae. It mentioned too much iron as one possible cause. I haven't gotten an iron test kit yet, but my well water is very high in iron. I've changed my ratio of well water to RO water when I do water changes to see if that helps. Went from 66/33 to 50/50.
@Koi I had never thought of poor water circulation as causing algae. I added an air stone to the other corner last week, and my cypts are loving it! They grew overnight the first day I put it in, I swear.
I'm also suspecting my overpopulation of platy babies is contributing to my problems, so I'm trying to patiently wait it out until they are big enough to either take to the LFS or put in the 75 gallon.