lol.. Rams IMO then may be out of question if you have hardish water.
You can go for Kribs (they can turn very aggressive when breeding though).. or Keyhole cichlids, Festivams, Bolivian Rams, Angels, Many tanganyikan fish but they will like some rock work as well and do not damage the plants as much as malawi cichlids do.
You can keep Tanganyikans if your PH is over 7.4 and hardness over 8dGH.
What ever you keep, you may not be able to keep a lot of cichlids in that tank unless you have a breeding pair of neolamprologus brichardi or any shellies and they spawn and form nuclear family.
Nim