Probably the most powerful cichlid is the majestic dovii or wolf cichlid - Parachromis dovii. These beasts are found in Nicaragua and are an aquarium favourite due to their size, level of interaction and intelligence. They are also surprisingly gentle with each other when a pair forms. Males can be huge compared to females and seeing an adult male nuzzle a female and young fry is particularly satisfying.
In the wild these fish often have a symbiotic relationship with Hyphsophrys nicaraguensis where the male nic helps guard the dovii fry and in turn gets protection. Willem Heijns has shot some amazing footage of this phenomena.
One has to bear in mibd these are huge and exremely powerful cichlids. Males can easily top 20 inches and females can grow to more than a foot. They therefore require large living quaters - 200 gallons being a good starting point. A breeding pair will liquidise tankmates but single males or females can be mixed with caution.
