Absolutely new to this and learning. Any advice l,...

Hey there Hypnotit , what i can see is slight magnesium deficiency probably due to the light schedule which you've fixed , but it might not be enough now that the "ball is rolling". See the "burnt edges" on the sides of the leafs ? that's the magnesium deficiency , so what I suggest is adding cal mag, in fact i would say, never grow without cal mag. Add it to your feed and make it into a foliar spray 3ml/L twice a week. The problem should stop spreading and the plants should recover fairly quickly. Hope this helps ! 🚀

@Hypnotit The wavy shape of the leaves in pic 6/7 suggests slight overwatering. Don’t sweat it. I just did that and I’ve been growing many years. Cannabis is nothing if not resilient. I don’t grow auto, but I recall reading a seed bank rep here on GD say that autos prefer a short dark period over 24/0. Like 20/4 or 21/3. Good luck and enjoy your harvest Thanks for the provocative name! Sex and cannabis go together, that’s for sure. Don’t you agree @Silky_smooth?

Well everything you have done so far says that you are off to a good start with this journal..There are a vast number of member who will hit up this question with similar answers ..keep doing what you are and if ever in dought check out growweedeasy.com it has some of the most vast easy to understand knowledge out there hope this helps..