What are the dimensions of the tank? Ideally for those Wrasses you would have 4' long by 18" wide. They are very active, and will use all of that room. The C. laboutie can be on the aggressive side. An acclimation box will be a must if you do add any more Wrasses.
Finally, I would personally just get one female when getting Fairy Wrasses. The single female will almost always turn male, just as it would if you got a pair. They are much less expensive, and they are usually juvenile, so you know you will have them for a few years. When you buy a male, it could be on its last year or two when you buy it.
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