Are you planning on having a male or a female? Males will limit your options to small shoaling fish with dull coloration and shorter fins. For females it's essentially the same except they tolerate tankmates more, even colorful ones. In general, go for peaceful and non-nippy fish. Avoid any larger fish and steer clear of any other anabantoids. Female guppies work alright for this purpose, neon tetras, other schooling tetras, Cory cats, shrimp, ADF
's, plecos, loaches, etc.