I have a medium planted tank that I have been slowly adding fish to. I have 10 cardinal tetras, 2 platys, 4 otocinclus and 4 small bristlenose plecos. I'd like to add a few "fun\different" fish or inverts. What suggestions do you have for a centerpiece fish or some cool non-fish that I could add? I've considered African dwarf frogs or red cherry shrimp or a larger interesting fish to finish off my tank, but am looking for suggestions. Thoughts?