hdultra, If you dont mind, link were you got your information.
Ive heard of the Whitecheek being a more aggressive species and need larger aquariums, If you wouldnt mind, What size is your tank?
When getting the Surgeon, put your hand over the tank that he/she is in and see if it goes to the top for food, If not, he could possibly be sick and you shouldnt get him, They have been known to be hard to nurse back to health.
What are you inhabitants? This being the more aggressive surgeon species, It will be more aggressive to new comers introduced to the aquarium, so Its best introduced last, and in a tank with semi-aggressive fish.
Also make sure to feed it veggies, In the wild, they are found munching on all sorts of algae.