Welcome to Fish Lore

If your tank has had fish in it for a year it's most likely cycled.
Here's a basic explantion of it:
When you start your tank.....
First your
ammonia will rise from fish waste and left over food.
In a few weeks bacteria will begin to develop and you'll see the
nitrite levels rise and the ammonia levels start to drop.
After a few more weeks another type of bacteria will begin to develop and you'll see the
nitrate levels rise and the nitrite levels drop.
When you having readings of 0 on both ammonia and nitrites with some nitrates (5-10) showing, your cycle is done.
MissMTS was just concerned because your aquarium info indicates you don't know about it.
Now that you've added new fish, it would be a good idea to check you ammonia, nitrite and nitrate levels to be sure the cycle is still in tact.
Your gouramis are beautiful, good luck with your tank.
