I have recently notices some yellow leaf spots on my plants... They are in flood and drain setup with 400 watt mh and ph is 5.8 They had some leaf burn because I started giveing them nutes too soon... Anyway they are now on their 27 th day from seed and they are only 4-5 inches tall and have about 6-12 leaves depending on the plant.But like I said I've noticed some yellow spots that look like burns on my leaves..I have been feeding them straight water for 4 days so I dont' know why it is happening because the ph is contiunuus at 5.6-5.8 I really want to help them grow better now that they have a bit of foliage but I don't want all the leaves to die/dry/or yellow because I have lost a few already... What can I do to help my plants grow better???