Please go to the learning center and read: hatching chicks 101. There is a lot of good information in that article. It will answer questions you never knew you had. It should be required reading before any one ever plugs in an incubator. If your bator has a fan, you want your temp to read...
I just love guinea pigs. When I was a girl, I had a guinea pig. I bribed, black mailed, begged my dad, and he brought home a male to go with my female. It blows my mind how awesome those babies are! Look just like adults in miniature, and they slide out of the chute on the run! I had one...
It doesn't matter that the feed turns to mush when you ferment it. simply keep it on the dry side, like thick cooked oatmeal. Unless your grains are very fine, I'd not give them the fermented grains until they are 3 weeks old. Some chicks have issues with impaction if they try to eat grains...