the intake fan supplies your tent with fresh air, if you don't have 1 you will need a vent in your tent so the exhaust fan draws the air into your tent passively
the only thing you are missing is an intake fan but you can just use a vent in the tent for a passive intake
what strain are you thinking of growing
i'm in the uk too
you need to vary your PH between 5.8 - 6.3 a couple of times a week or you will lock out MG
your plants also look over watered and or overfed (too much N) hard to tell under that purple light
just noticed your feeding them at an EC of 2.5, at that stage of growth i dont go over 1.5 EC
the leaf looks over nuted or over watered, i would give um plain water for a few days see if that sorts them, make sure you let them dry out before watering
compost is probably too hot, just let um burn it off, i would not flush you may release more nutes, starting plants in the final pot slows growth as the wet/dry cycle takes longer, pot up as the roots fill the pots out, = more oxygen to the roots
hi danny, iam still lurking lol, i hang about in the grow section mainly, i dont think my tongue is sharp enough for talk+toke these days, lol
just bought a bungalow the MS is battering me now, just hope i can keep growing, my only passion, o and my new aquarium
not seen you on much lately