The yellow tips I can say are due to pH. If possible, measure the pH of the runoff; if the values are between 6.2 and 6.8, you’re good. Otherwise, water with water that has a pH of 6. If you think it’s a lack of water, just water slowly until you get a little runoff. I don’t think it’s from overwatering, but as I mentioned, it’s due to alkaline pH. You can also raise your panel a few cm because your plant will grow a bit taller.