Renogaw has a really good suggestion-if you cannot resist purchasing another fish.
But, as you will see over and over again, patience is the key to success. Overloading a tank with too many fish is never a good idea and yours is a NEW tank. 6 weeks is NEW. Many of us do not put any fish in our tanks in the fist six weeks of establishment.
Iwould suggest enjoying the fish you have, wait a few months and see how everything goes, then add your third fish. Your foxface will grow fairly large and when your clown is an adult, your tank wont look so empty!