day 8 duck eggs when to throw away?

[smiths12]

so my eggs have been in this incubator for 8 days. I'm sure there is about 3 that don't look like anything has happened and one that looks just like blood ring, should I wait or throw them away. excuse the pencil marks, I'm sure this is dead? also can I check whats humditiy the incubator should be at ?

 

[fourkidsandduck]

If you're sure they are dead toss them. If you not sure leave them in. You will know when you see a good one, which ones are bad. What type incubator are you using?