I’m just really hoping the KIND soil ships soon 
I have a big bag of Roots now, it def. wasn’t the cheapest but I’d plan to use the KIND on bottom (3lbs), then fill to -1 " w/roots on top, per KINDs instructions.
I really don’t want to get into manual nutrients on the first run… if so I’d do a HF or OF bottom w/a mix or roots / perlite & coco coir on top (mimicking Kinds instructions basically). I thought I read on this forum somewhere that OF recently has had a PH issue. I’d have to try and find that.
Awesome tip about the sprout, thank you… it’s a little too late for adding soil as I did it last night (Sprout check in - #25 by SpaceInvader) , and it’s already stretched out again. I’ve made a few adjustments this am to the light, I don’t have a meter but a decently reviewed app has the top of the cup / canopy between 22k - 25k lux, which after some quick googling seems too strong. I’ve adjusted the intensity down to ~13k and misted a bag and put it over it. Temp is 78.9 w/RH at 58 (and rising):
I think I had it too high and too low initially, now it’s a lot lower but with reduced power, hopefully that helps.