Thank you kindly @magnata!

Thank you for your analysis, I think they may have been slightly deficient but last night I fed them a very light Cal-Mag feeding, and today they really look fantastic.

Some of the lower foliage was showing this possible deficiency earlier in the grow, but I wasn't sure if it was from too much of something or not enough. I had not fed them for the past couple of weeks until last night, and they had begun stabilizing their color with no feed.

It's also previously used soil that I fed nutrients to, so maybe some residual was still in there.

I appreciate your nice comment!