@Sally Sunshine & everybody who can help!!
Of my 24 eggs I set only 6 are fertile and showing development. 18 are clear!

They all arrived well packaged on next day delivery so we're not in the post in too long. Only 1 maybe 2 had slightly saddle air cells and I mean slight.
Day seven candling has been a total let down

Only 4 of the Columbian black tails and 2 of the pekin are developing. The rest are clear including all 6 orpingtons.
Before I send an email to the breeder I would appreciate your thoughts if you think this is a fertility issue. I'm sure it has to be as the eggs were in good shape.
Thanks!