I would give them some weak fertilizer. I re-pot my seedlings into potting mix with fertilizer in it when they have at least 2 sets of true leaves (miracle grow). So they get some pretty early. That said, I have kept them in seed starting mix longer with no ill effects, but once they outgrow the little seed starting cups and about 4-5" tall they have problems if not put into a larger cup with potting mix.
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