Heavily planted, sand substrate, and Geophagus Jurupari or Brasiliensis pair.
Eartheaters are great characters, and really interesting to watch. They also fetch a half decent price. LFS like to get hold of females, as most of the breeders use hormones to ensure most fry are male, to keep the prices high!
Have a look, brasiliensis are often overlooked when Juvenile, but adult colours are awesome. My pair have some fantastic finnage and pearlescant scales