The Aquarium Den is a Members Only den. It is available in the Diamond shop for 5 gems.
The Aquarium den is a two story den. On the first floor there are large windows through which you can see sharks, jellyfish, and fish. There are some paintings on the walls above the windows of fish and such. There is a long, curved staircase that leads up to the second story. On the wall next to the staircase there is a mural of a Mermaid with a blue tail and long, flowing blue hair. On the second story of the den there is a small hallway overlooking the first floor below. It has another mural of the sea on that wall.
- There is a trap door on the first floor that if you pass through the doggy-door styled door you can see your animal in scuba-diving gear through the window.