I like all of the ideas. And do you guys think an Emperor 400 would be too much for a 20 long? I have it as an extra filter and would rather not buy another one. My little top fin one broke.
I was also thinking a school of cories for the bottom and maybe some angels. Yeah?
German Ram, Bolivian Ram, Kribs are the most common dwarf cichlids...I would personally eithier do a planted dwarf cichlid tank with a school of tetras, a planted shrimp tank, or a planted dwarf puffer tank
I say a nice planted tank with Bolivian rams and a school of tetras (whichever you prefer)
OR...
you could do a breeding pair of cons as mentioned before