hey there you have a few things happening at once so i'll just go through them : see how the leafs are really really green, actually they're too green you can tell from how they're glossy. that's from too much N, you dont really need to fertilise that much at this stage , and you're seeing this problem start to just about burn the tips on some of the leafs. so that's what's up with the very tips burning. On the sides of the leafs you see the same very light burning but on the serrated edges of the leafs, that's because the plant needs extra magnesium when you have a heavy light schedule. you need to start spraying some cal mag on the plant twice a week and add it to the feed. Finally the little scratch marks in the middle of the leafs.... looks like bugs man, and that's really bad, hopefully is just some white flies. Get rid of them by following a stricter wet dry cycle, just wait a bit longer between waterings and water just a little bit less, the dry soil is bad for the eggs so hopefully it's enough to fix everything. Hope this helps ! 🚀