Just some words on the Sixline Wrasse......I had one in a 34g with one Ocellaris Clownfish and the Wrasse seemed to act a bit aggressively towards the Clown. They are really cool fish though!
I have a 6 line in my 37g never once has he showed any aggression towards his tank mates
I had more issues with the dotty back ( no wonder he is gone now )
yes cardinals are nice fish but they tend to hide more and more,
mine only seem to come out at feeding and when the moonlights come on