Athosanswered grow question 6 years ago There's a couple of issues that you should correct. First, over feeding, you can see some burnt tips and that the foliage has a really dark green color, which points to nitrogen toxicity; second, there's signs of over watering (the leaves that look puffy between the veins). Either the dose is too high, or you are feeding too often (or both), I would dial back the bio grow to 1 ml per liter for now. Now, the curled edges could be due a combination of the nute excess, over watering and there might be some heat stress due the lights been too close. Dial back the bio grow and increase the light distance a couple of inches.