THANK YOU!I made a thread on this same topic before! Here:
http://www.aquariacentral.com/forums/showthread.php?t=143424
I suggest mulites, they may not be the best looking fish, but when you see them in their pack like fomration, and the drama that goes on, you feel like your watching the dicovey channel. You could fit 6 in a 20. just put sand on the bottom and a hell of alot of escargo shells. Soon you will see a dominant male, but with so many laces to hide, and all that room, he wont bother the others.(unless they try to get frisky with any females)![]()
If you are going all cichlids,then it should either be one pair or hareem,or all singles.You could get a ram,a keyhole,a krib, or an apisto,and you should be fine.I would not get any more than 3 singles however.
20gal is not enough for a pair of rams. get a 30. in a 20, chichlids are impossible. they like territory and they get annoyed when they keep having to fight over space. do a planted tank with an angel in there and a few cories.
It's not that you need the dithers, it's that there is not enough territory for multiple pairs of rams or kribs in a 20 gallon tank. If you got 6 dwarf cichlids in a 20G you'd see a lot of fighting, and the weaker individuals could be bullied to death. And since that footprint really only has enough room for 1 cichlid pair (or 2 non-paired individuals), but the bioload could certainly handle more, the OP would probably want some schooling fish and corys to fill up the tank.