Thirty birds, even a two bird feeder (10.5" wide) would cover 30 birds with two feeders. Once the pecking order is worked out there will be little fighting at the feeder as with two feeders one will be open at any given time other than right off the roost in the morning. You would need to...
experience from the commercial flocks that use our feeder shows that the more feeders you have the more birds per feeder you can get away with. Even during "rush hour" when they come off the roost one feeder is likely to be open. I have seen bird loads as high as sixty per feeder in commercial...