Rangakuanswered grow question 4y ago They look a bit cold , by the time they go to sleep you donāt want the medium to be too wet so they are ready for a feed at lights on and to stop the medium getting cold when the lights are off .
It says 19c so that temp is alright so Iām guessing the medium is a bit cold and or wet at sleep time .
When itās cold in the off cycle and Iām in veg mode I use a little oil heater at the intake , it has the plants standing up tips to the sky and adds some nice humidity.