Tanklet: Idle Fish Aquarium

Breed & collect koi betta fish

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Raise your own fish: feed, breed, host rare visitors, send treasure expeditions. Open new ecosystem tanks and display them in nine ambient rooms — your fish never die. Tanklet is a cozy aquarium game where you raise a tank of fish that's truly yours. Feed them, clean the tank, keep the water healthy, and watch them drift through a beautifully rendered aquarium — all the joy and companionship of fishkeeping, none of the cost or mess. ■ Care for your fish Feed on schedule, clean the tank, and manage water quality. Well-cared-for fish stay healthy, happy, and earn more coins. Neglect them and they get listless or sick — but good care always brings them back. Your fish never die. ■ Rare visitors Wild fish drop by from time to time. Feed them, keep the water clean, and set out the decorations they love — treat them well and they may stay for good. The rarer the visitor, the pickier they are. ■ Personalities & bonds Every fish has its own personality. Greet them daily and serve their favorite treats to deepen your bond, unlocking little stories and rewards. ■ Collect & breed From clownfish, blue tang and angelfish to golden arowana and koi, collect distinctive species and fill your codex. Breed pairs for offspring, with a chance at rare variants and shiny fish. ■ Eggs with honest odds Hatch mystery eggs for new species — drop rates are disclosed before every purchase, with a pity system that guarantees rare finds. ■ Send fish on treasure hunts Pick 1–2 fish for expeditions to the reef, a shipwreck, or the deep abyss. Hours later they return with coins, decorations — sometimes even pearls. Strong bonds and healthy fish bring better luck. ■ Make the tank yours Buy and freely place plants, driftwood, rocks and more. Resize, restyle, and decorate your tank exactly how you like it. ■ More tanks, real ecosystems Save up for a second and third tank: freshwater, saltwater and coral ecosystems each boost matching fish. Every tank has its own theme and decorations, and fish can move anytime. ■ Ambient Mode: put your tank in a room Hide the interface and let your tank live in a warm little room. Nine rooms to swap — an indigo moon window, a brick loft, a green library, a coastal cottage… each room's light truly falls into the water. Keep the screen on and it becomes living furniture. ■ Grows while you're away Close the app and your fish keep you company while coins keep accruing. Come back to collect offline earnings and see what happened. ■ Calm, anywhere A Home Screen widget brings your tank to your desktop; soft water-sound ambience helps you unwind; iCloud keeps your tank in sync across devices. No ads, no third-party SDKs, zero data collection — your tank is yours alone. Subscribe to Tanklet+ for double coins, offline earnings extended 8→24 hours, auto-care while away, a monthly pearl gift, and exclusive decor. Slow down. Keep some fish. Privacy Policy: https://smartkiitos.com/tanklet/privacy/ Terms of Use: https://smartkiitos.com/tanklet/terms/

  • 5.0
    out of 5
    1 Ratings

A new fish, and breeding mutations you can actually see. · New species: Red Swordtail — the freshwater classic trailing a crimson blade, now in the shop and the collection. · Mutant offspring: mutated fry now wear a clearly different coloration — unmistakable in the tank, in details and in storage — with a soft violet shimmer. The collection gains a “Mutant” slot for every species, and mutants you bred earlier are credited automatically. · Storage: tap any fish to see its details (name, species, stats, bond) — no more guessing who is who. The storage list has been redesigned to be cleaner. · Fixes: breeding no longer labels ordinary fry as mutations; fish away on expedition can’t be released or moved. Thanks for every bit of feedback!

The developer, Liwei Xie, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    • Smart Kiitos Oy
    Size
    • 76 MB
    Category
    • Casual
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 11 more
    • English, French, German, Indonesian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Thai, Traditional Chinese, Vietnamese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Ambient Rooms Pack $4.99
    • Vault of Pearls $19.99
    • Coral Reef Decor Pack $2.99
    • Chest of Pearls $9.99
    • Jar of Pearls $4.99
    • Tanklet+ Yearly $14.99
    • Tanklet+ Monthly $1.99
    • Pouch of Pearls $1.99
    • Handful of Pearls $0.99
    Copyright
    • © 2026 Smart Kiitös Oy