i have 4 kuhli loaches, 3 platies (kinda big & look more like mollies), 3 rams (2 are juvies), like 8 juvie white clouds, 3 amano shrimp, and 7 blackline rasporas in my 20L. its alot but im doing 25% w/c's a week and i havent lost one fish (aside from some white clouds) in it since i started the tank 6 months ago. i plan on moving them to my 29g probably tomorrow in order to make room for a puffer.