Hey, Kathy - I actually do incubate my Marans a tad higher (about 5 higher during incubation and hatch) and get a better hatch, HOWEVER, I hesitate to give exact numbers to anyone hatching, because it truly does depend on your natural humidity in the air, as well as altitude. It's a tough decision to make when you're hatching other breeds, too. When I do that, I go with what I deem to be "normal" for humidity in my area.
Also - I do the weight loss method, which works NO MATTER WHERE YOU ARE IN THE COUNTRY. It's foolproof! But, since you've already set them, you really can't switch over now, because you must get weights from the set date.
BEST of luck on your hatch!! My Marans eggs have actually lightened up quite a bit; they are at the very end of their layiing cycle for the year. I was going to put in an egg shell sample of when they are laying their darkest eggs, but forgot - sorry about that! Let me know if you'd like a shell sample, as I'm more than happy to pop one in the mail!
Also - I do the weight loss method, which works NO MATTER WHERE YOU ARE IN THE COUNTRY. It's foolproof! But, since you've already set them, you really can't switch over now, because you must get weights from the set date.
BEST of luck on your hatch!! My Marans eggs have actually lightened up quite a bit; they are at the very end of their layiing cycle for the year. I was going to put in an egg shell sample of when they are laying their darkest eggs, but forgot - sorry about that! Let me know if you'd like a shell sample, as I'm more than happy to pop one in the mail!