Your outdoor setup looks really good. I'm curious to see how it will turn. And the power plant is one of my best memories from amsterdam ( arrived at 7pm I was already sleeping at 8 : strong strain)
on the bottle is written that the max 4mm is but if i gave from the start 4mm the plant wil show signs of too much nutritien thats why i build it up so that they can use to this amount and i think that when i give them 3.5 mm what they need because they are getting bigger and when a plant grows they need more nutrien they grow a bit faster butt i dont give them alga bloom because i don't wanna have a strange taste in the buds