Honestly my rescue C. monoculus is the most aggressive eater out of all my Cichla. I have a soft spot for C. orinocensis (probably the reason I have so many of them) but out of all my fish C. orinocensis, C. kelberi, C. piquiti, C. "intermedia", and that rescue he is the only that will come out and bite the crap out of me when my hand hit the water. I'm not sure if it just because he is dumber than my WCs or what but he is very aggressive when it comes to food. I think you should look through pictures of others fish and decide for yourself what fish you want to get. It sad to see these fish sitting in an lfs 55 gallon at 12" because someone thought they would be cool until they figure out how much they eat and they haven't got any color because they are stressed and aren't of the right diet. However I do recommend more than a few.... I know I am a Cichlaholic but these fish thrive on competition and community. In the wild it isn't rare to see a shoal of 20 or more with fry.