Cantsmokethat - I wouldn't recommend germing in the propagator itself personally, but if you are going to, make sure your sprayers are on a timer and not on permanently. It will waterlog the rockwool and probably kill the beans.
A few pointers, seeing as it's your first grow (stuff I learned the hard way):
- don't use excellent beans for your first time - use bagseed to practice germination
- I prefer germining directly into coco - easy, effective, cheap (use coco jiffys for an aero cloner)
- Alternatively, germ in tissue paper and then move into rockwool and into your aero prop and then run the sprayers once a day for 15 minutes until roots have appeared outside the rw, then you can up the timing to 3x a day and then full time.
Plenty of good germination info here...the search button and the GrowFAQ are your friends. Welcome to the Farm :rastadancing: :)