Of course he means convict, and that link is not going to answer his question. This will work with convicts until they start attempting to form pairs and breed. Once a pair forms you will most likely have some casualties. The best way (in my opinion) is to keep convicts as a pair in a 15gal or larger aquarium, and let them breed. To me, the convict's breeding and parenting behavior is the most interesting aspect of this fish.