Pocket Aquarium 方寸水族

From the Devs

Raise a little tank of fish, right on your desktop

Pocket Aquarium (方寸水族) is a cozy, minimalist desktop aquarium. No pressure, no failure — just you, a tank of water, and a group of easygoing little creatures to keep you company.

🐟 Collect & Raise

Start with a tiny fry, feed it and care for it, and watch it slowly grow into a full-grown fish.

• Dozens of charming fish, shrimp and snails — neon tetras, guppies, angelfish, pufferfish, arowana, corydoras, dwarf shrimp, crystal shrimp, ramshorn snails, and more.

• The better you raise them — and the happier they are — the more vivid their colors grow over time (four levels in all).

• Offer regular, live, or sinking food to suit each creature's habits.

• Happy adult fish earn passive income — even while you're offline — so you can buy more creatures and decorations.

🌿 Build Your Dream Aquascape

It's your tank — arrange it however you like.

• A rich selection of plants, rocks and driftwood, plus special decorations like a castle, a sunken ship, a white church, Mt. Fuji, and a little volcano.

• Freely switch substrate, backgrounds and lighting to craft your own atmosphere.

• Light shifts between day and night, with tiny particles and gentle currents drifting through the water.

🐠 Every Creature Has Its Own Personality

The creatures here aren't decorations — they're truly alive.

• Fish school, forage, hide and nap; shrimp graze on algae, and snails slowly climb across your decorations.

• Some have their own quirks — pufferfish peck at shrimp and snails, male guppies court the females, and angelfish chase down fish smaller than themselves.

• Tap the tank and watch them scatter in fright, then slowly settle back down.

✨ Unlock Gorgeous, Dreamlike Fish

Raise certain fish to max level to summon legendary special fish — a ghostly, semi-transparent spirit fish; a dragon king shimmering with rainbow light; an emperor wearing a crown, escorted by a retinue of tiny guards… and more for you to discover.

🖥️ Desktop Pet Mode

Switch over with one click and your aquarium becomes a transparent window, with fish swimming across your desktop. While you work or browse, your little fish keep you quiet company in the corner of your screen. Toggle the info bar and background to taste.

🎨 Minimal · Relaxing · Play Anytime

No countdowns, no winning or losing — just open it, take a glance, and breathe.

Build your own Pocket Aquarium, and let these little friends share life's quiet moments with you.