The Aquarium is filled with many different life forms, including fish, sponges, sea slugs and plants. The four fish species -- Angel, Clown, Handlefish, and Neon, all eat similar foods, and are in turn eaten by another fish species, the Rainbow Sharkling. The other striking feature is the new food source available only in the Aquarium -- filter feeding. Many of the organisms in the Aquarium live by filtering nutrients out of the sea water, and thus don't actually eat any other animal at all. There is always plenty for your Norns to eat in the Aquarium, but they need to find it.