Advice needed, duck Incubation fluid?

[BethyBeth]

Hello,
I've owned ducks before, but this is my first hatch. It's now day 29. Temp has been 99.5 up until lockdown, at which point I decreased it by a degree. Humidity has been 55%, until lockdown, at which point I increased it.

Candled eggs, and they're all still moving, but no pips. It seems like there is some kind of fluid build up on the opposite end of the egg from the aircell? I cant find anything on this online. Advice please?

 

[Wolfi]

could be the yolk before it's been absorbed

 

[BethyBeth]

After putting a different humidity gauge and thermometer in than I've been using, I now think everything has been horribly off for the majority of the incubation

 

[Wolfi]

humidity should be 65% althroughout before lockdown, then raised to 75-80% during lockdown, so maybe they didnt develop properly