Spatial Aquarium allows you to place a fish tank in your real-world environment.
Select from Betta, Arowana, or Koi scenes, and customize the scene with five different tank shapes and backgrounds of rocks or coral reefs.
Tap the Feed Fish button to display food that attracts the fish.
Fish and food can be moved with a pinch-drag gesture.
The app also includes two miniature ocean scenes: one representing the modern sea with whales, dolphins, sea turtles, fish, and crabs; and another depicting the Mesozoic sea, home to ammonites, mosasaurs, elasmosaurs, and pterosaurs.