Apistos mostly

As promised, more pics.

DSC03289.JPG DSC03291.JPG DSC03294.JPG DSC03297.JPG
 
In a 20L, I'd be afraid the dominant male would be able to wreak way too much havoc on the others. Additionally, the best part of keeping apistos is watching their fascinating brood behavior. If you're not interested in breeding, I'd still keep a pair and just neglect to pull the fry.
 
AquariaCentral.com