16 out of 22??   thats great! Dont give up on the other six!

a little mold? like green mold?   it happens. i get some green mold on my rockwool cubes but its not a big deal. It shouldnt even phase the plant! Congratulations!  I hope you have enough room for 22 plants.

in the next few days you can start to give them more air by cracking open your vent on the humidity dome or lifting the lid for a few mins every day so they can get used to the outside world