When they grew a bit their pen was absolutely full.
How did you feel about the overgrown pen?
I got tired of that ugly sight.
You should acquire a bigger living space for your animal. Keeping them in a tight space will stress them out and lead them to being stressed out all the time. It may lead to more vet visits too, wasting time and money.
It's okay I'm fine with the idea of zoo.
If you are going to continue to keep raising animals, you should consider expanding your area to keep them in. The space could quickly become unhygienic and your animals may be stressed. I'm sure you'd want them to be happy with more freedom to roam.