some info on this Argentina Pike:
Found only in Missiones Province, a river in the Parana drainage at high elevation, and mostly in the headwaters of that river. Ph 7.2, slightly hard water, temperature range from 58F to 78F. This fish can reach a size of 40 cm (16") - a little bigger than most lugubris group crenicichla. Very hard to collect with declining numbers in the wild. A winter cool-down period is recommended for breeding and biotope replication. Higher metabolism than most cichlids, no wonder they seem so hyper with constant activity and inquisitivity.