Basil seedlings-how big should they be

New to this click and grow. How big should seedlings be before I take dome off. I can just barely see their beginnings.

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We welcome you @italiancan21!

Depends on the seedlings but it is safe to take the domes off by the 2nd week of growing. Some growers take the domes off if they notice a green speckle but it is safer to keep them on until you see them almost touching the dome.