Fish Tank

Your phone becomes an aquarium.

Turn your phone into your own fish tank. Light from behind your phone realistically comes through the water with tropical fish swimming around castles, coral and seaweed.

Coming soon to the App Store Free to download · iPhone and iPad

See it in action

Like a real tank, right on your desk.


Demo animation goes here: upload fishtank-demo.gif next to this page.

Fish Tank running on a phone: fish swimming with the room visible through the water

Recorded on a phone: the fish swim in front of the real room behind it.

6tropical fish
4tanks to choose from
4ornaments to place
5lighting moods

The glass trick

See your room through the water.

Your phone's camera looks out the back while the fish swim on the screen, and the picture becomes the back of the tank. Move the phone and the room behind the water moves with it, just like looking through a real glass tank.

Rather have something else behind the fish? Pick one of your own photos, or a dark background for a calm night-time tank.

Build your tank

  • Yellow Wrasse, Domino Damsel, Flag Tail and Silver Dollar, with up to eight of each
  • Coral Reef, Driftwood and Rock Garden tanks
  • A Moai statue and a deep-sea diver for the sand

Light it your way

  • Ocean blue, lagoon green, sunset red or daylight, or a slow colour cycle
  • Water clarity from tinted to crystal clear
  • Bubbles with a soft bubbling sound, or silence

Bring it to life

  • Tap the glass and the nearest fish swims over
  • Predator mode: an angelfish chases a school of neon tetras
  • Drag across the tank, or tilt your phone, to turn the ornaments
Tilting a phone to turn the ornaments

Keep it on your desk

  • Save a photo of your fish swimming in your own room
  • The controls fade away, leaving just the tank
  • Keep-screen-awake for a desk or bedside aquarium
Fish Tank on a desk

Fish Tank Plus

One purchase. Yours to keep.

Fish Tank is free to download. Fish Tank Plus adds more to your tank with a single in-app purchase. No ads, and no subscription.

  • The Goldfish and Angelfish
  • Castle and treasure chest ornaments
  • The Sunken Ruins tank

Already bought it? Use Restore Purchases in the app's settings on any of your devices.

The camera picture stays on your phone.

Fish Tank only uses the camera to draw the room behind the tank. Nothing is recorded or uploaded, and the app has no ads and no accounts. Photos are saved to your library only when you tap the camera button.