I have a 26 gallon bow front with a pair of Bolivian Rams and 3 Cory cats. I would like a school to inhabit the mid to top level as well as serve as dither for the Rams. While at the fish store today, I saw some interesting tetras: Von rio tetra Black phantom tetra Buenos Aires tetra What do you think of those? Any other ideas or suggestions? So many tetras to choose from. Thanks!