I got a used 20 gallon for my 12th birthday. 1968 or so. It leaked and the smell of curing silicone is forever linked to tanks for me. That guppy bred but I didn’t know to protect the young. They didn’t last long in the plastic shrubbery.A very young managuensis cichlid (Parachromis managuensis)A young Salvini cichlid (Cichlasoma salvini)Managuensis about to spar.Territorial nips.A red tiger oscar (Astronotus ocellatus), Talipia (right) and an unknown tank-mate.A Jack Dempsey cichlid (Rocio octofasciata) looking clamped and unhappy.A Corydoras catfish.Another photo of the Dempsey & various other tank occupants. I think I had this tank in 1990 or so.A five spot jewel cichlid (Hemichromis fasciatus)This is a 60 gallon long. The 1994 incarnation. Used as a room divider. My semi-loft futon platform is in the backgroundRed tiger oscars, that old Jack Dempsey, a managuensis, a salvini, a geophagus and a Heros severus.The same crew with a better view of the geophagus