Six-Line Wrasse

[mr_alberta]

From your list I would go:

Blue Chromis
Goby (if one is desired)
Royal Gramma
Coral Beauty
Sixline

I don't know what the behavior of an Anthia is, so I wouldn't know where to place them in the list. Also, when you say "Blue Chromis" do you mean the Blue-Green Chromis (cheap $9 ones) or the Blue Chromis from the Great Barrier Reef (darker blue with a very distinct lyre tail and black stripe on its back)? The Blue Green ones are supposedly more peaceful than the other, but I'm sure they're both pushovers compared to an established 6-line.