I also have week-old baby chicks! This is my first flock, so I can only speak to my experience with these little ones so far.
I did try to feed them fermented whole grain starter beginning on day one, but they HATED it. Would recoil from it and wipe their little beaks furiously after trying it. I tried different things to tempt them - yogurt, scrambled egg, different serving dishes, different places in the brooder. No dice.
They do love their DRY whole grain chick feed, though. So I thought maybe if I took a little of the fermented feed, and mixed in enough dry feed so that it was crumbly *maybe, just maybe* they would like it.
And it worked! They've been eating a small bowl of it for the last two days. They were five days old when I finally had success. But again, I think it's because I've mixed enough of the dry food into it so that it's no longer too wet and sticky, as someone else mentioned.
Keep trying, and hopefully you'll have some luck soon! PS - I've been keeping my ferment in the fridge to slow the fermentation so I don't have to waste it and that's worked great =)