For your size tank, I agree with ReefPlayground, in that their are many species of African Rift Cichlids that are ideal from Lakes Malawi, Tanganyika and Victoria, that remain fairly small and do better in smaller tanks and often are less aggressive with a larger population of them.
If you still want South or Central American cichlids, I would go with Acara's, Rams or Jewels. _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |