To answer your question, "Yes."
General rule of thumb is that they should be kept in a quad ratio. You can keep them in larger colonies with the general quad ratio (6 hens, 2 roos, etc.) That being said however, they often make their own rules and the situation may require you to change the ratio.
For example, I was aiming for that ratio and have two cages of 6 hens, 2 roos. In one cage, one roo was being beat up by the other roo, so I moved him to the other cage. Everyone was happy and the girls weren't being beat up or anything. Recently, I moved the roo back to the first cage and now both cages are having issues.
The birds in both cages are broodmates so they are all the same age and the cages are next to each other so they can see each other.
I would move him back to see if I could get peace back but I've selected the birds in one cage as breeders and he didn't make the cut.
This is only if you want fertile eggs. If you are keeping stock to eventually eat, then it doesn't matter what the ratio is as long as no one is fighting or having issues.