I did see the burnt tips on lower growth but them leaves are getting no energy. Without information on grow we are guessing but yes something needs addressedLooks like some kind of deficiency.
Id give them a mil each of the bloom and grow at this stage mate only the half mil doses in the earlier stages there hungry rn all the rest of the bio bizz stuff helps but it's not so important as those two so you could keep those at the same dose with the rest of the stuff if you prefer also topmax is more a bloom booster for the end of bloomI changed light cycle to 12/12 couple of days ago. They are on 12,5 liter pots and about 10% coco fiber and 10% vermiculite, I have given them Bio Bizz nutrients.
I have used this nutrient schedule but use half of those amounts https://www.biobizz.com/wp-content/uploads/2023/10/Nutrient-Schedule-EN-PF-2024.pdf. So I have given once that upper charts amounts, but I don't have all of those. So 0,5 ml/l Bio-Grow, Bio-Bloom and Top-Max and 1 ml/l Bio-Heaven and Acti-Vera.