I plan on setting some eggs this week. Six will be Silkies, 12 will be Easter Eggers, and 10 will be Seramas. I've heard that Serama eggs hatch in 19 days. Should I then set the others a few days earlier than the Seramas? And if I can't do that because of the age of the eggs, how to I manage the hatch? Any other tips on hatching Seramas?