Hi, my cucumber seedlings, now plants, are turning white in the edges of their leaves. I noticed something similar starting on one of my pepper plants, too. Maybe something to do with soil/nutrition? Watering? I’m using sunblaster 2400 grow lights, and I planted in organic starter soil. Images attached. I realize I probably started these too early; I did recently transplant them into larger containers, so I know the roots aren’t troubled. Thanks for your help. Amy