The soil is a mix of "Intratuin moestuingrond Bio" (40%) (mostly in the top), "Intratuin potgrond Speciaal" (50%) and Perlite (10%). I mixed them without really measuring inside each pot before planting so the percentages are a bit of a guess.
Today before watering I tried to lower the PH of the dutch tap water which was around 7.5. I managed to bring it down with Plagron PH min.
Humidity varies from 60% to ~75%. It drops low when the exhaust fan is on and I have that on a schedule to keep up some humidity for the seedlings. The dehumidifier is on its way to have better control.
The fan and the light are plugged on top of remotely controllable plugs (from action.com).
For the light an automatic schedule is set for turning off the light's plug at 00:00 and on at 06:00.
The temperature/moisture is measured with a Govee hygrometer/thermometer that is set on the level of the pots in the pocket on the back of the tent.
I've also installed a camera to spy on the little ones remotely and without opening the tent.