I have noticed that ducks who hatch with the umbilical cord still attached often don't fluff up easily. I don't understand it, but it seems to be a pattern. They are usually all right after 24 hours or so.
I would be a little concerned that the younger one is considerably more coordinated than the other, but it still might be okay too.
Personally, I would help out the chick that has been zipped for 20 hours. That's not normal. I'm assuming by "zipped" you mean that the chick has poked holes all the way around the top of the egg so that the "lid" is no longer connected to the bottom, or is hanging on by only a small section? If it has been sitting like that for 20 hours, then it is probably in trouble. It is usually quite safe to help them at that point--just pop that top off and pop her back in the bator.
It sounds like humidity problems to me, but it might be a problem with the eggs too--still, I would never try to *reduce* the humidity during a hatch. You want it good and moist in there to prevent membranes from drying out, which will cause the chicks to have a very hard time getting out. It can also cause problems like poor yolk absorption.
Don't beat yourself up, though. We all make mistakes in incubating. Just do the best you can and learn from the experience. It sounds like the chicks are going to be just fine--they just need a little extra TLC.
I would be a little concerned that the younger one is considerably more coordinated than the other, but it still might be okay too.
Personally, I would help out the chick that has been zipped for 20 hours. That's not normal. I'm assuming by "zipped" you mean that the chick has poked holes all the way around the top of the egg so that the "lid" is no longer connected to the bottom, or is hanging on by only a small section? If it has been sitting like that for 20 hours, then it is probably in trouble. It is usually quite safe to help them at that point--just pop that top off and pop her back in the bator.
It sounds like humidity problems to me, but it might be a problem with the eggs too--still, I would never try to *reduce* the humidity during a hatch. You want it good and moist in there to prevent membranes from drying out, which will cause the chicks to have a very hard time getting out. It can also cause problems like poor yolk absorption.
Don't beat yourself up, though. We all make mistakes in incubating. Just do the best you can and learn from the experience. It sounds like the chicks are going to be just fine--they just need a little extra TLC.