Under your account I see the fish pack #3 but I don't see Aquarium Desktop. You do have the MyColors Aquarium but that isn't the same product. The MyColors theme just makes the desktop have a look of a fish tank. The Aquarium Desktop 2009 actually puts the items on your desktop along with animated fish. That is a separate purchase all together.
This is the product that you would need. HERE
Please let me know if you have questions.