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Pepper seedlings are yellowing

My pepper seedlings are a few weeks old and the leaves are yellowing. They are planted in 4” cow pots in potting soil; I try not to over-water, but who knows. They are under LED grow lights. I germinated them on a heat mat, but they’re no longer on that mat, as I’m using it for other seeds. I’ve feetilized them with liquid fertilizer at half stength, but still no improvement. Today I sprinkled them with granular fertilizer, but haven’t watered yet. Any ideas to help get the new leaves to grow green? Thanks!

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