Looks like a light issue to me. Both plants are drooping, one just has twisted leaves. It's too early to be a feeding issue... The plant will feed off of its
cotyledon leaves for the first two weeks or so until the root zone is established. The Sf4000 is 400-450 watts right? At 15%, that's like 60w of light. If you're in a 1ft x 1ft space, that's fine, if your in a tent of any size, I'd turn the light to 30% minimum. You can't over water coco so it's no over watering.. I'd increase the light wattage to at least 100w for a 2x2 tent and 200 if its any bigger than that.
cotyledon leaves for the first two weeks or so until the root zone is established. The Sf4000 is 400-450 watts right? At 15%, that's like 60w of light. If you're in a 1ft x 1ft space, that's fine, if your in a tent of any size, I'd turn the light to 30% minimum. You can't over water coco so it's no over watering.. I'd increase the light wattage to at least 100w for a 2x2 tent and 200 if its any bigger than that.