I name them all...
Convict is Guido (she turned out to be a girl, but she's been very boy-like, so it stays.)
Firemouth is Moby (cuz he/she's a ****)
Jack Dempsey is Fluffy
Green Severum is Sushi (she got chewed on her first 2 days in the tank)
The Spotted Pictus are all named Steve. (Can't tell them apart)
The Black Skirt Tetras don't have names (except for the tiniest one, who I named "Eight", because I'd count them every morning to make sure none got eaten, and one was always "missing".. Turns out he likes going his OWN way, and doesn't fully appreciate schooling yet, so he goes and bothers the bigger fish.)