hey here ! you have mild symptoms of lots of not that bad issues,mosly related to overwatering, so at the young plant stage it's often difficult to dose the water right. Seems like a bit of overwatering probably last week made the nitrogen a little bit too available for the plant and it slighty burnt the tips . next looks like some water stayed on the plant during the daylight hours and made just a little bit of damage. finally looks like you light schedule is a bit too much for the plant and it needs just a little bit more cal mag. Basically you're doing every thing right , get some cal mag, let the soil dry out some more and you'll be just fine . Hope this helps ! 🚀