Plants not yellow but not that green either, what do they need?

Im a first time grower growing in coco and have 4 plants currently 45 days from seed. I’m feeding these girls roughly 200 ppms- cal mag, GH Grow & Micro, silica blast and a drop of super thrive.. they’re growing fast but I feel like their color is not as green as it should be, what can I do to fix it? Or what do they need?
I drained the bottom of the pots too btw, I never leave them sitting in their water

I don't use GH but 200 ppm is lite for coco. Coco doesn't have nutrients. You need to be working your way up to 600-800 by now. Go slow. Or look at one of the many GH charts out there

Yes, they look a bit hungry.