Is two roos one too many for 13 hens??

[McChooky]

Old rule of thumb was 7 hens per rooster.

Adding hens to make the roosters happy made it worse. It took getting rid of half the flock and one of those jerks to make it work.
(Some of the hens went with him)I have 8 with mine

 

[Altairsky]

I think one roo per coop is enough trouble regardless of the number of hens. What works best IMHO is keep smaller flocks in multiple coops with one roo per coop. It mimics the natural society of wild chicken tribes.