The Hemp Goddess said:
I don't think it is a good idea to use a dome with seedlings. As soon as they pop, get them close to your fluoros and get some "wind" (a fan) blowing on them to strengthen the stems.
My experience with humidity is this;>P
When I lived on the left coast at 30 ft, the humidity averaged 80% and rarely dropped below 60%, so I would have agreed with you, but now that I live in the sierras at 1500 ft the situation has changed greatly and I'm having to learn how to do many things (including using humidity domes) differently=>)
My point is that if the naturally occurring humidity in your area is high enough to keep young plants moist YAY, if not domes might be called for;>)
The recommended ph is 5-6!>)