Thank you for all the kind words! I think I'm going to go with Dahlia. A little dramatic and gothic, just like him. :P Alduin was a close second, but my fish is a bit of a coward so perhaps naming him after a dragon isn't the best idea.
He's finally eating a bit more; I was able to get three bloodworms down his gullet today. He is coloring up a teeny bit, although he wasn't all that dull to start with (I think he hadn't been on the shelf long). He has a tiny metallic moustache that makes his mouth look wider. :P I'll try to get a pic soon.