Queen of Slugs tankmates (Botia dario) in 55g of level?

I have a gallon aquarium 55 48 "x18" x13 ". I have 6 (2" adolescents, which is expected to reach 2.75 "in adulthood) Bengal loach and 2 (two" adults) dwarf clown plecos in it and I'd like something more for go there with them. I'm looking for something that does not cause many problems. I was thinking of a school of catfish glass or ax, and they both seem fine with some of the current in the water and therefore stay at the top. I would not mind watching some other peaceful fish community before making a decision. I ideally something a light body color. I have black sand as the substrate and the gray slate and driftwood as decorations Malaysia Virginia / caves. I have a good set of lights integrated moon lighting my current U.S. team satellite, so the idea of light-colored things that will be displayed in the moonlight entertains me. Thanks any suggestion or idea.

You can try tetras schooling of different types, beards, angels, platies saw a picture of them and I've never seen personally. They are very cool fish!

Huge Barbs and Arowana tank / Großbarben und Gabelbart @ Aquazoo [2/48]