That's very interesting. How long did it take to change the smell? I probably would have added more vinegar instead of sugar but that would have been a wild guess. I did have some chick starter scratch mixture fermenting in bowls in the house (I still don't have my bucket system set up. Still trying to figure out the best way so I don't spend money and then have to do something different). The chicks started eating less and this bowl didn't get used. When I made more, I forgot about that bowl and it sat on the table for two days, fermenting away, and I uncovered it the other night and boy did it smell! Not bad, but definitely very strong! I added some more vinegar and a little water and used that bowl first in the morning.
I wanted to ask... what do you guys do in the winter? How do you protect your ff from freezing? This is something I will have to take into account before I get my bigger system up and running too.