Pink Streaked Wrasse + Four Line Wrasse

I have a pink streak & a possum. They get along fine. I've read somewhere that six lines are not compatible with pink streaks. How closely related are 4 lines & 6 lines?
 
The 4line will eventually kill the pink streak wrasse. 4lines are closely related to 6lines and have all their attitude and aggression.
 
+2 pink streak are a very timid species but that makes they great with non bullies or other peaceful species.
 
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