Fish advise

[Jason McK]

I have recently started a 40G tank and moved my clowns and Anemone to it. I was wonder about another fish for my 75G. I currently have 3 Chromis, Bicoloured Blennie, White Cheeked Surgeon, and a cleaner wrasse.
Now that could be enough already but I wanted some suggestions on another fish (if you feel the tank can handle it)
I was wondering about a Copper Banded Butterfly?

Anyone

Jason