OP said he was not in a position to upgrade....so i think the nic,1 sev,and 1 sajica would be good.chocolate,uaru,syns would outgrow the tank.it would look cramped when they start to put on size.if you buy them young get 3-4 of each then pick all males or females as the grow out.maybe first see if you will be able to sell/trade the others before trying that way.another common cichlid fish that most stores have is JD,firemouths