First grow, stay patient, use SOIL as it's much more forgiving for your first couple of grows, just stick with 2 nutrient Canna Terra A + B, your plants will drop after a watering. Don't mess around with, PK Cal Mag etc etc just A and B for your first run, your plants will tell you if it needs more or less otherwise your going on wild huge nutrient run away. Humidity is going to be higher average also.
You have massive height there so you should really be able to grow whatever you want, oh and there's nothing wrong with adding an extra extractor if needed
Keep us updated my man and keep us all updated.
Just stay positive, patient, and if you make a mistake don't expect it to fix itself over night it will take a few days to change, also first grow just use Veg nutes and Bloom nutes thats it, don't mess around with anything else at first or you will just get confused and make it worse, also on your first grow use Soil, a proper one like BioBizz light as it's much more forgiving, move up to semi hydro or hydro once you have learnt plant behaviours.
You got here to help you out anyway, you will hear plenty of people saying it needs CalMag for about every problem but don't listen to this, if your plants have been at 45⁰ all day then start dropping it's because the have had enough light and want a rest so just put them to bed for 6 to 8 hours, next day after an hour of light they will look premium again.
Good luck