I've never cared for rummies. That's more
@Slaphppy7 's department. To me they just look injured, like something tried to eat their heads and didn't succeed.

They should be called "Nosebleed tetras." (Slap and I have had this argument for years, ha ha) Glowlights, green neons, cardinals, rubies, and red phantoms are all nice. I've never kept rubies but they look amazing. Red phantoms are one of my all-time
favorite fish, though. There are also hatchetfish and pencilfish, both of which are nice alternatives to tetras. So many possibilities!