FIRST GROW

WEEK 1 My first grow and thus far I think its been okay besides a hick up with the NL seed not sprouting. I worry that they may be a little stunted because some mornings the temp has been 18°C after the lights turn off but I've put a heater in the grow space with a timer to go off for 15 minutes every hour for the coldest periods of having the light off. No nutrients so far, mostly been watering with a spray bottle. The temp is a bit hot in the pictures because of the new heater being in the way of the fan. Also I have a humidity dome but I'm not too sure on using it as I've read they can be bad for seedlings?? *Side note the mystery seeds were germinated two days before the others