Bolivian rams are by far the hardiest and easiest to keep of all the dwarf cichlids
https://www.seriouslyfish.com/species/nannacara-anomala/
79 is a little high for them, really nice little fish though. Very timid so make sure the tank is well planted. If you just have one you might want to add a small school of tetras to give them a bit of confidence in the tank, a small school of Ember or Green Neon Tetras (two of the smallest tetras) would be good candidates - more common tetras like regular Neons or Glowlights would be too big though.
Wills