They did stalled and I bet it was mainly due to shit airflow in the room for about 5-7 days. The out vent were set to be turning on for 5 min every 20 min. The vent pumping air inside was on 24h a day but the intake was TO LOW!!! + To high humidity70-80%.
We clearly sense the problem entering the room after being out 2 days on a birthday party. We then maxed out air in and out significantly, increased light strength, decreased light distance and added 2 fans into the room. I can clearly see a positive reaction from that and I think that part of the story is on its way to get sorted.
However my main concern and response I'm looking from this thread is your view on the yellow spotted leaves. Lets highlight the fact ones more that the sick leaves are just few right next to each other. Is this not a suggestion if not an evidence that there is something just started to spread around? And if so what is it then and how should I treat it? We sprayed entire grow with Epsom salt just now, but what else? Should we not take infected plants into separate quarantine room or prevent the spread in any way?