Epsilon F1 Test 60X60X120cm

I started low-stress training with tent pegs and a bit of defoliation, and all looks good. I've started adding 1g per Litre of Epsom salts to feed. The air filter is up and running, I am trying something different, all my fans are USB-powered ( 75 cubic m/hr) except the circulation fan I have also added another light, which is a 60w cheap Aliexpress job. The new total power output is around 170w. There are hints of flowering and I will need to adjust the feeding supplements. Yup, I'm sorta making it up as I go along but it seems to be working out so far.😁 I'm concerned about humidity levels and will gladly take any low-cost suggestions.