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2 week old seedlings are yellowing from the center of the leaf out. Seedings were sprouted in a Burpee starter tray. I've been watering with PH'd water very sparingly. I can see roots in holes in the bottom of the starter tray, so root development seems normal. I've not added any nutrients to...

Hello all! I'm new to posting, but have been reading for months now. My question: is there any problems other than heat for seedlings to start out under the HPS instead of CFL's? How high above the seedlings can I go before they start to stretch? I'm trying to keep the temp down. At two...