my first grow

So I have discovered Fungus Gnats. I stopped watering for one day. placed Perlite on top on all the plants, brought Flytraps, and placed a bowl with vinegar and a drop of soap in the garden. Fly trap is definitely working About the watering and feeding. I have made the conclusion that I need a watering strategy and try and stick to this. I will feed as much every day that it will produce runoff around 1-1,5L/plant. also I have adjusted the EC to around 1.7 in week 6 and actually aiming for +200-300 in the runoff. It's a huge subject and as a noob grower it can be very overwhelming and frustration on what to do. So what I did was read a lot on the subject, and ask some questions. Still many different opinions. But mainly I took the information from here https://www.royalqueenseeds.com/blog-cannabis-water-quality-part-2-ppm-ec-n298 and here https://www.cocoforcannabis.com/ectargets/ one sites says early bloom is 1,9-2-0 and other says 1,1-1,4 which is backed up by https://www.mandalaseeds.com/Guides/Fertilizing-Smart-Guide so I think I would be in the safe zone as around the middle, and also take into consideration that my tap water is 0.4 EC I will observe, but the AH seems fine, it is the younger FB and SK that perhaps was overfed a bit. (see my grow question) The reason is obvious as I was a bit lazy and just fed them the same as the 12 days older plants. It has been adjusted now, and I will monitoring the runoff in a few days. EC is now 1.4 for FB and SK The AH started to show the gender today- all females :-) exactly as this fellow grower did see, on the same day 38 https://growdiaries.com/diaries/4823-amnesia-haze-auto-by-magnetous/week/23434 day 31: The FB and SK made it into week 5, but no signs of sex. the EC are a bit high, around 1.9 ms but it's still not as much as the 12 days older AH. I will lower the inflow a bit. the SK looks amazing, though one is a bit small. The FB still shows signs of problems with some brows spots on the leafs I topped one FB and also took off some fan's I also topped the smallest SK Day40 FB and SK had a new round of LST. the small SK did not respond so good the the topping, but the other one did. Perhaps the small one should have been discarded from the beginning, but at this is my first grow, I want to learn, and see the development of all plants. Since I started to lower EC to 1.4, but fertigate twice a day 2 x 1 L, they respond amazingly, and seem to grow quicker now. the runoff is also within the +300EC range so everything is perfect. I also lowered the light to around 40 cm from the top. I have received my Aqua Medic platinum line plus 24V but I am still in doubt if I want to change water in the middle of the grow. let see...