As soon as the first seeds germinate, I remove the domes and get the fluorescent tube lights within 2" of the seedlings. (I'm not familiar with the pink ones.) Make sure there's some air flow, spritz the cells where germination hasn't taken place yet to keep the soilless mix damp but not soggy. What mix are you using? What's the temperature? How many hours are the lights on? Not sure what's causing the yellow cots so soon.
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