IMO, if it smells of forest floor then it's fine -- even if you see those white threads that you get under leaf litter, etc.
If it smells like moldy bread or rotten food then it's not fine. Likewise if you get an anaerobic, sewage-type odor.
I have a rather large flock so my system is easily capable of absorbing all our family's food scraps -- even scraps from canning, etc. -- without trouble. If I only had a handful of birds I'd be much more careful about how much I put into the run at once.
If it smells like moldy bread or rotten food then it's not fine. Likewise if you get an anaerobic, sewage-type odor.
I have a rather large flock so my system is easily capable of absorbing all our family's food scraps -- even scraps from canning, etc. -- without trouble. If I only had a handful of birds I'd be much more careful about how much I put into the run at once.