Aquarium Simulator Online

✓ Free online 3D fish tank, open it and just watch

A living 3D fish tank in your browser. Feed it 6 pinches a day and watch every fish grow from a tiny fry into a full-grown adult — free, no sign-up, no ads, nothing to lose.

• 📈 Fish grow as they eatEvery pellet a fish swallows is remembered for that individual fish. It grows from 46% of adult size up to 122%, passing three visible stages — fry, young, full-grown — with a celebration at each one.
• 🍤 6 pinches of food a dayThe daily food counter sits in the corner. Each tap on the water, or on the food button, spends one of the six pinches. It refills on its own at local midnight, so raising the tank stays a small daily habit.
• 🐣 No hunger, no death, no penaltyProgress only ever goes up. Skip a day or skip a month — nothing starves, nothing shrinks, nothing dies. The tank simply waits exactly where you left it.
• 🐠 Five species that grow at their own paceSmall blue tetras fill up after 10 pellets, clownfish after 15, yellow tangs 18, long-finned bettas 20, and the big bottom-cruiser needs 30. Big fish eat more and grow slower, just like real ones.

Full guide, how-to & FAQ →