Calvis are very slow growers but can get to 6". I think it is too small but would propably be fine as just a breeding tank. I don`t want to step on any
ones toes so sorry if I came accross as a bit formal.
I think their is a very high chance of runting them.
I have kept them in Tang setups and although beautiful fish they can be a bit
bland looking on their own.
A small Apistogramma tank I think would look cool, Shellies especially Multies
are cool to watch. I had videos on my old phone of them attacking my hand
when it entered the water and they did not even have any young.:headbang2: