heya blunder
you a hydro grower? that why you're in hydroton/rockwool?
I'm kind of confused HOW they got like that... you say a simple fogger...???
I'd go with the classics for cloning. Humidity dome over is all you need... that much moisture is killing ya! Those little white spots may have been your plant trying to air-root, a sure sign the humidity was outta control too high.
With fungus, you now need to sterilize everything so the spores don't spread. Bleach your system, pots, any hydroton that came into contact with the infected plants.