chicks dying within 24 hrs after hatching & others can't hardly stand

WHAT IS WRONG: chicks will pip and then after 24 to 30 hrs later they have not got any farther as though they have quit trying to get out the shell. So I have to help them out of shell and when I get the shell off them there is no blood and no attached bilicord or any sighns of being one and the chicks seem to be very weak and can't or won't try to stand up. and have a very low chirp when they do chirp. 2 chicks died within 24 hrs of hatching and 1 now is 2 days old and seems to be very weak it can't run around because it falls over it can stand but not for long and almost acts as though one leg is not as strong as the other. I have another chick in the brooder that is about 3 hrs old it is still not fully dry and it is in the same spot as it was 3 hrs ago the only thing different is instead of it being on it side it is now upright sitting. and is makeing no sound unless I hold it.

AM I NEW AT THIS: no I have hatched over 500 chicks and in the time frame of 5 yrs might have lost 2

WHAT KIND ARE THEY: silkie's and buff orphington

TYPE OF INCUBATOR: still air and have always had a 90 plus hatch rate
TEMP OF INCUBATOR: 98*
WATER RESIVORE: FULL
air hole open

what I am feeding: nutrenea chick starter medicator

what do I think might be wrong: maybe incubator is melfuctioning or a bacteria
WHAT HAVE I TRIED: I have made sure not to put dirty eggs in incubator , keep water in resivore at all times, make sure temp stays between 97 and 98 degrees, they are in my house so I can constanly check on them. I leave them in incubator till totaly dry then put them in a ten gallon fish aquirum with pine shaving for floor and heat lamp with room for them to get away if gets to hot. always have fresh water.

SOMEONE PLEASE HELP!!!!!

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could it be ur breeding blood to close thats what causes weak chicks

How is your humidity? I normally only increase the humidity the last day to 72%-78%.

my humidity meter went down 2 days ago and as for in breeding the rooster cam fromm one breeder and then hens came from another and both breeders are responsible and the silkie's came from a show breeder and are not supposed to be related

Your temp sounds low to me. I believe a still air incubator should aim to be at about 101.5. This may be causing chicks to be weaker and slower developing. Your humidity looks good.

ETA: You may want to consider raising your humidity sooner. I just realized you only do that the last day. This could be causing chicks to get stuck that have internally pipped a day or so earlier. By the time you help them out, they may already be too weak to survive.

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or most show breeders will breed the same gen to keep blood
like me i breed mother and farther then put the chicks to the farther and doi it again at the 2nd gen u stop and bring in new blood for what u know they may already of done this a couple times

oh great I am new to silkie so I am still trying to learn about them the women who gave me the eggs said they were from her silkie coops where there was multiple hens and roos. I did have one silkie hatch 2 days ago normal and was acting normal but the next morning I found her on her side and dead.

that is what I am scared of but I don't want to break them out too soon eaither. and as for the temp they are in a large incubator that has fan moving air and then 3 days before they should hatch I move them to the still air
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hmm thats weird must be something else

I am totaly lost that is why I need you all help