I never use humidity domes for seeds, but cuttings is a must they need to under a dome for the 1st week or until rooted.
I found with rockwool cubes pre-soaked to ph 5.5 then left under the dome it stays too moist and if its like 1 week or 2 weeks the ph normally is well off on the cubes then...I prefer to keep them moist with watering them sparingly with the right ph otherwise I used to get funky twisted growth on seedlings which only just delays things until it the ph of the medium was dialed back in.
My basement is super dry at times.
I think if I keep a hygrometer in there and aim for 40-55% humidity for seeds it should be all good.
This time I decided I was gonna not obsess over them (checking every hour) and the hubby was like DONT LEAVE ME ALONE with the baby cus he was tired. So I rushed and didnt do things proper.
I made a sticky on my phone next to my ph adjustment notes of a step by step procedure for seeds so I do it by the book next time and don't miss anything.
I have 7 seedlings looking good and growing leaves. Two I killed. Two seeds I am trying to coax into popping with 81* and 55% humidity. It drops over a day or so to 42%. Then mist and monitor back up to 55 i go.
I really hope those two pop.