We just had our first Pekin duck hatch in the incubator, first time doing this! He came out and is rambling around the incubator, step all over the other eggs and shoving them around! What do we do now? How long do we leave him in there - 6 - 12 hrs? Then move to brooder, right? Also, there was a sac of "something" left in the egg, is this normal! Any help appreciated!!