Thx man. A cichlid tank has crossed my mind. Almost purchased red ciebals a few timesBeing a one trick (cichlid) pony, my choice for an unheated, small, peaceful community would be a geographically correct Uruguayan tank with a quartet of Gymnogeophagus (1 male 3 females), a shoal of Buenos Aires Tetras, and some Uruguayan corys (such as erhardti)
Gymno quilero
or Gymno sp Paso Pache
Corydorus erhardti
This type community has been one of my favorite tanks.