white fur on stems of sprouts

hey all i just out some seed into the rapid rooter that i have used before with great results. most of the seedlings have a white fuss on them there r some clone cutting in the same dome that don't seem to be bothered. one seedling has shot up very fast about 2 in but is covered with the white fur like substance. i have removed the humidity dome and put a fan on them as im think this is a fungus. r my plants doomed or is ther a chance this will help.
looking a 100% seed falur if this dosent help................third batch and first problem. please help if u can think of any thing that would help
thanx hattiesdad

Hello Mr. Hat

smart move removing the dome and adding a fan.... I had 100 clones covered in this fuzz once.. after removing the dome, they all recovered...

so iz it fungus