Duck egg lockdown humidity issue - please help!

[Dgrif5]

I currently have one lone duck egg on lockdown, and it's late day 26. I got the humidity to 65-70% last night, and it's held stable until now. This morning, the egg pipped (and quite a large pip too, almost thought it was going straight for the zip!), and so the humidity has become a bigger concern. The past few hours, it's started to drop slightly, and is now hovering around 62%. I imagine anything under 60% would be way too low, so i'm starting to panic about what to do here. Sadly this incubator doesn't have a nice hole at the top like some that I can just drip water into, so i'm not sure what to do! should I wait and see, and hope it starts to zip before the humidity drops too low!? or should I try to open it up and top up the water, though humidity always seems to plummet quit rapidly in this one once opened? Any advice would be greatly appreciated!!

 

[casportpony]

What kind of incubator is it? Can you post some pictures?

 

[Dgrif5]

it's a terrible Chinese one, a hhd like this one HERE. it's my backup one for the one advanced egg, as the ones in the main incubator are a few days behind.

 

[Dgrif5]

it's down to 61% now, and i'm getting worried.. i'm going to have to do something soon, but i'm still not sure what..