Es300 Auto Train Wreck

5x5s are on backorder so moved to a larger closet to give the plants a bit more space. One of my Train wrecks is flowering well but my leaves have burnt tips and are yellowing. I'm watering at a ph of around 6.5-6.6. Ff Coco loco may call for a lower ph so I'm going to adjust that in the coming weeks. My other train wreck is doing just fine and im watering at the same ph and water so I'm a little confused and insight would be helpful. My northern lights (plant on far left) is doing well. Starting to flower and I think is done stretching. My cookies is long and filling in, starting to bud. Kindof difficult to fit him in tight spaces but I'm excited for the final product. I planted that about 2-3 weeks after the train wrecks and northern lights. Other than that, this new closet is pretty nice. The AC Infinity fan and thermostat is super nice. We have good airflow and steady temps at 72-78, lights off/lights on respectfully. Insight on yellowing leaves would be helpful* thanks!