I know Cichlids are very intelligent but which one stands out to you for brain power? For me the most intelligent has to be a Geophagus Steindachneri Red Hump Eartheater. My adult male was very intelligent, very crafty and was extremely confident with everything. He made his tank his home and if a sunken pellet ended up under a rock he set about unearthing it for days on end sometimes even a week. Constant digging but used to do it in such a way so that the rock wouldnt fall it was very funny. Great Cichlid.