It's no secret at all, it's Canna Terra Pro Plus soil, Canna Terra Veg then Bloom and PK 13/14, Boost Accelerator, Rhizotonic... EC is an average of 1.4 PH is average 6.2, RH fluctuates 50 and 75, temp between 19 and 28 Celcius
I don't trim the roots at all, plants do it themselves, cups are cut at the bottom so that they can bottom feed themselves as well from the tray they sit in, you need to find a balance here between watering and bottom feeding and it can be a little tricky and I think some strains don't like it at all, I have had a couple of disasters/learning experiences LOL
You can do it yourself, I'm no master grower, I only started in October last year and I also just came almost last in a Solo Cup competition LOL
I'll snap a few more pics later so you get a better idea, they haven't finished yet so it is no success or win just yet

If you like this one you will like my Auto Elefant in a hybrid Solo Cup x Hydro Bucket setup, all same nutes in Hydro solution as well.