anabantoid stocking?

So, I have a 6.6gal tank (16" long/8.5" deep/11.2" tall) that I am hoping to stock with centerpiece anabantoid. In the past I've kept male B. splendens, but am hoping to branch out a bit. The tank has a Marineland Penguin 100B HOB filter, although I've figured out how to the slow down the...