Growth looks good. The red stem are somewhat genetics on some strains. You shouldn't worry about that too much. If your plant is developing normally still then everything is under control.
For the mold issue Check your air circulation make sure to have both a circulating fan to constantly move air around and another fan under you canopy to push all that hot air upward. With your situation, at this stage of the growth that's really most you can do. I would suggest defoliting massively some fan leaves hoping the issue doesn't spread.
Lastly if possible keep your temperatures low it will greatly help you. If the temperature variables you entered for this week are right then it's not a good idea to almost have a difference of 5°C in your day to night time. Make it 23 during the day then 21 at night or 24 then 22.
Don't give up! It's not easy but with time and practice you will be good
Keep up 💪🏽
@Simba732, hi, thank you very much for the advice
in the following days all the leaves were defoliated and another fan was added and the problem was solved.... however the humidity was up to 65% so I was worried and honestly checked the buds and everything was good
@High_Voltage, that’s awesome ! for your next run get you a dehumidifier. When dealing with high temperatures your best bet during flowering is keeping the humidity low. Bugs and mold love Hot/ humid environments if not checked they can mess up a good harvest with ease.
Also defoliating helps but if not done correctly at the right time all those leaves removed will hurt your bud weight. Some autos are really sensitive.
I see you have all the nutrients already which is perfect just lightly invest in your environment control for your next run and your harvests will be better 👌🏾
Great work so far 🙌🏾