Wrasse question.

[TimT]

It depends a lot on the size and gender identification of the wrasses,
2 females... not a problem,
2 sub dominant males... not a problem,
2 dominant males... expect possible issues. Greater the chance the larger they are.

Also the following will affect aggressiveness/fighting
size of the tank,
layout of liverock... can they always see each other,
availability of food.

They will jump if chased so make sure your tank can keep them in.