Important FACT.
You cant understock a tank. Running a tank with less than the max fish just makes life easier. Keep 2 fish in a tank that could hold 10, and it's pretty much bulletproof.
Think of it like "How many cats can I have in my house?" Sure you can have 20, but then you are the Crazy Cat Lady. No one is surprised if you have one cat, why not have one fish?
If you are happy with your tank, leave it alone. More fish means you need to work harder to maintain the tank. Make a mistake and fish die.
Ian