Rams are the bomb! I have had them by themselves, in little ram packs, in a 110 planted with several species of fish and in my 20 gals. When together they just mess with each other mostly, and its pretty entertaining. You can almost hear the monotone of a national geographic narrator describing the behavior lol. Kribs are cool too, but I can't find those here, so I can't comment on those. But I have had shelldwellers and I would have to say that these are what I would go with if you can get your hands on them. I had the ocellatus, which are gold, and they are just too cool. Make sure you get about six or seven and a couple seashells. They like sand and they bury their shells. If you put some shiny objects in their tank the males will drag them to their shells. They will find females and keep em in their shell. They steal from other males back and forth, build up walls, and their fry usually end up being taken care of good if they are in a species only tank. If you have to reach in the tank they will probably nip your fingers. But seriously, you can't go wrong with either, all the small cichlids "are" small, but they pack all of the traits, behaviors, and attitudes of their bigger cousins.