It seems to me that the easiest no-touch systems are R/DWC, at least mine is.
I have a ~30g RDWC with four plants in a 5x5 with a Diablo Scorpion, and a homemade far-red fixture. There’s a chiller (rez → chiller → rez), and I have a Milwaukee pH controller feeding 10:1 dilute of ph up or down (depending on growth phase). Auto-top-off with filtered water (I have tap water with a chlorine/chloramine filter). Environmental controller keeping VPD between 1.2-1.5 (that’s high, because of CO2, without CO2
In my last grow, I was ~1000-1200 ppm CO2 so you may need to adjust nutes less often than I did, but 2-3x/week I’d have to add more nutes to keep the PPM/EC up.
