8 Line Wrasse

Really depends on where it's being introduced. I keep a 6 line in a mature tank with plenty of live grazing available and it's rather docile. I haven't kept an eight line wrasse but much of my reading has indicated they can be rather aggressive after establishing itself in an aquarium.
 
I'd agree that 8 lines are going to get more aggressive. If you want a wrasse that's more peaceful towards other fish look into fairies/flashers.
 
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