Hey buddy nice set up. I'm a fellow hydro head. Anything you need to know just tag me and I'll get back when I'm on
Couple things jumping out at me.
Firstly, keep the plant in just the rockwool for a few days till its rooted up.
Personally I go 2 weeks but just whenever there's a few roots poking through is good enough.
Reason being. You want the cubes like 30-40% wet. Too wet and the roots will drown, too dry and theyll fry. Keep it there and the roots will grow infinitely faster. They also just need water at this point. My taps run 48ppm and they can go on that for 6 days. Easiest way with best root development is in a humidity box of some sort. Mines cost 99p.
I seen you say you soaked them in ph water, did you rinse the shit out of em first? Gotta give em a good long rinse under slowish running water (so they dont fall apart) to get all the crap out. It's alkaline as fuck and stunts them if your unlucky. Last thing you need with autos.
Secondly that's a big tent. I'm too stoned to go hunting the lights down, I'll get sidetracked and go off on a tangent somewhere. ..
but you're probably a bit shy depending on what the green finger one is. Also cheap shit chinese blurples are alright. I use them amongst other things.
Really shit ones are brilliant for seedlings cos you can get em closer. Don't chuck it.
And lastly are you using sm90, hydroguard or something like that to keep the res clean? Some manage without it but it's really risky. Usually ends in root rot and masses of gunge.
I go for sm90. Only need 0.3ml/L so it goes pretty far like. Handy to use as a root booster for seedlings too