Hi everyone first time grower here and I'm not sure if this is the place for this question, but here goes. My seedling is four days old and I've noticed some slight discolouration on the first leaves, the ones after the cotyledons. It's not massive and its only very slight. I was just wondering what could be causing it? I've not used any nutes and I wasn't ph the water, but I am ph water now. I left the water out 24hrs and I'm growing in coco coir, other than that my baby seems to be doing fine . She's a wardrobe grow with a 300 watt LED, which is a good distance from her. Many thanks for your help and merry meet.