How big is your tank and what kind if Coris Wrasse?
As long as the tank is big enough (regular Coris can get over a foot long), you have deep sand and you understand that the Potters Wrasse is "Expert Only" you are fine.
I'm not trying to be rude, but if you have to ask if two wrasses are okay, I'm guessing the "expert" part is questionable. I know a lot, but do not consider myself "Expert". I tried a Leopard Wrasse once and it lived three months. Ate great, showed zero sign of disease and then it just disappeared. They are tricky.
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