Originally Posted by al89463
Hi I'm an amateur so correct me if I'm wrong but the type of rocks should be flat like slate, stack the rocks to form caves, and make sure you start building them close to the back otherwise they won't swim out to you often. Also since Africans would be tight in there, you could a breeding pair of convicts and watch the amazing course of their behaviors.
It doesn't matter really where, how, or what type of rocks you use. As long as you have caves. But, a breeding pair of convicts would fit perfectly in a 20 or 30.