After about a month I decided to rearrange in the nursery a little bit to get better humidity and to solv the temperature issues I have been dealing with…. it’s been working out really well.
I replanted the babies in tin cooking forms, then filled the mini-greenhouse bottom with leca and water. The leca works as an insulator, so now temp from the heatmat underneath stays around 24 degrees even when the room temp drops at night. With the water evaporation the RH stays around 80% even with a small 80mm fan driving fresh air in 24/7 which is very cool.
I am very happy with the result so far.