I'm surprised by the legginess of the seedlings on the left when you use 2 fluo tubes at a short distance of the leaves. Personnaly I added a third tube for safety sake to avoid problems with the heat before I replaced them with LED tubes. A possible explanation : you cover the seeds with plastic to keep the soil damp, and /or you let seeds germinate in the dark and don't give light soon enough. You can't wait for more than 2 / 3 hours when germination starts...
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