black specks floating in candled egg??

so today when i turned my duck eggs i candled all of them to see how they are progressing, all of them look really good. im on day 17 i think.
the last one i looked at had black floating specks in what was the little bit i could see through the egg. the duckling is active inside. but these black floaties are a cause for concern.
anyone have this happen? anyone know what it could be?.
thank you

 

i tryed to take a picture i went to go grab a camra and when i candled it again they had dissapered.. ill be keeping a close eye on that on or sure.
with a camra close at hand

it was so strange ive never seen that before they are like free floating really black specks.. but other than that its growing and moving in injoying the warm bator as i shovel snow outside freezing my fanny off!!
1 didnt grow so we are down to 9 but those guys are still being very fisty

 

the one with the floaties?? its a khakis
posted this somewhere else and some one had the same thing, asked, no one answered but later found out it was just fuzzys off of them
prolly from them kicking themselves
the Anconas egg is doing so good it always dances for me when i candle it moves so much and ive been talking to it (already my fav HAHA)

 

i will wont be long
we are on day 19
oh i am really enjoying them yesterday i saw a duckie foot in the eggs i was every excited i called my daughter in to look.
i have a friend that might i might give a few to she has two KC a drake and a duck. so i thought i would share since you where so sweet to me im thinking that it would be good karma for me to spread the sweetness
but im picking them out lol