if by 'beauty' you mean by looks. personally i would say it has to be out of Discus, fully grown A.Heckelii and some Geophagus's, (most notably the 'Tapajos' and 'Surinimensis') types. Fully grown mature adult is just amazing, with their intense blues/reds and them lond extensions to their finnage. . . But, everybody has different opinions. and would disagree with me.