ChillTank
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The fishkeeper’s field guide · 2026 edition

10 cozy aquarium games.
Find your kind of calm.

Rare fish to discover. A planted tank to get just right. A quiet pond to return to. These are our picks for aquarium and fishkeeping games on Steam, from cozy idle fish collectors to hands-on fish tank simulators.

By Chillwatch, developer of ChillTank
Updated

Find your next aquarium game ↓
Fish swimming beneath a wooden bridge in ChillTank’s cozy low-poly habitat
A little world worth slowing down for. ChillTank gameplay.

A note on the list: this is our editorial selection, based on the developers’ official Steam descriptions, rather than an independent product test or popularity chart. We make ChillTank, and #2 is our own developer pick. Other games have no affiliation with or endorsement of ChillTank. Their names and trademarks belong to their respective owners. All artwork on this page depicts ChillTank. Follow each Steam link for current availability, features and system requirements.

Start with the experience you want

Which fish tank game is right for you?

For rare fish and steady collection progress, start with Chillquarium. For drawing your own fish and a creative aquarium sandbox, explore Drawquarium. For a low-poly aquarium world with breeding and habitat decoration, try ChillTank’s free demo. If you want fish beside your other work, look at Tiny Aquarium or Cozy Littlequarium. For aquascaping, detailed care or running a public aquarium, the rest of the list opens up different ways to play.

Ten Steam aquarium games, compared by play style. Platform information refers to the Steam editions.
GameBest matchSteam platformsAvailability
1. ChillquariumIdle collectingWindows · macOSReleased
2. ChillTankCollecting, breeding & habitatsWindows · macOS · LinuxComing soon · free demo available
3. DrawquariumDrawing & aquarium sandboxWindowsPlanned Q4 2026 · free demo available
4. Tiny Aquarium: Social FishkeepingDesktop idle companionWindows · macOS · LinuxReleased
5. Fish GameDetailed freshwater simulationWindowsReleased
6. Cozy LittlequariumDesktop care & breedingWindowsReleased
7. FISHERYStylized aquarium sandboxWindowsEarly Access
8. Aquarium DesignerAquascaping & design projectsWindowsReleased
9. MegaquariumAquarium management tycoonWindows · macOS · LinuxReleased
10. My KoiRelaxing koi pondWindows on SteamReleased
01
The idle fish collector

Chillquarium

Opening a new pack and finding that one rare fish.

Buy fish, let them grow in real time, then sell them to build up your aquarium. The simple loop leaves room for the real attraction: discovering exotic species and rare colour variants. It is an inviting starting point if your favourite part of an aquarium game is completing the collection.

Choose it for a focused collecting loop and the anticipation of your next discovery.

  • Fish collecting
  • Idle
  • Rare colours
Platforms
Windows · macOS
Availability
Released
Visit Chillquarium on Steam ↗
02
Our pick for a little world of your own

ChillTankChillTank

Getting attached to individual fish and shaping their home.

Collect, feed and grow fish, discover skins and traits, unlock breeding, and shape a cozy low-poly habitat with plants, rocks and decorations. ChillTank combines fish progression with a personal underwater space you can keep making your own. Gameplay and saves stay local; optional Steam features do not need to stand between you and your tank.

We develop ChillTank, so #2 is our own developer pick. Try the free Steam demo to decide whether its pace and style suit you.

  • Low-poly
  • Fish breeding
  • Offline singleplayer
Platforms
Windows · macOS · Linux
Availability
Coming soon · free demo available
Wishlist ChillTank on Steam ↗ Play the free demo ↗
ChillTank gameplay showing fish below a wooden bridge in a green low-poly habitat
ChillTank gameplay · Your fish, your little corner of the world.
Meet the fish & explore every skin →
03
For fishkeepers who love to draw

Drawquarium

Creating the creatures that make your aquarium yours.

Draw fish and plants, care for your creations and decorate their aquarium. Drawquarium makes creative expression the starting point, with an animated desktop wallpaper mode for keeping your underwater world nearby.

Choose Drawquarium for drawing your own inhabitants. For collecting designed fish, breeding and shaping low-poly habitats, explore ChillTank. Both offer a free Steam demo.

  • Draw your own fish
  • Creative sandbox
  • Desktop wallpaper
Platforms
Windows
Availability
Planned Q4 2026 · free demo available
Visit Drawquarium on Steam ↗
04
A tiny companion with a social side

Tiny Aquarium: Social Fishkeeping

Keeping fish company while you do something else.

A little aquarium at the bottom of your screen: hatch fish, decorate, fish for new discoveries and visit other aquariums. Fish keep growing while you are away. Its desktop format and social features make it a different kind of daily companion from a dedicated full-screen aquarium.

Choose it when a small screen footprint and sharing the fishkeeping habit are part of the appeal.

  • Desktop companion
  • Offline growth
  • Social fishkeeping
Platforms
Windows · macOS · Linux
Availability
Released
Visit Tiny Aquarium: Social Fishkeeping on Steam ↗
05
For the freshwater fishkeeper

Fish Game

Watching personalities, relationships and water quality.

Fish Game pays attention to the animals as individuals, their relationships and the water they live in. Build a planted freshwater aquarium and learn how its inhabitants get along. It leans toward the observation and care side of fishkeeping rather than a quick collection checklist.

Choose it for a more detailed freshwater simulation. Breeding is listed as planned, so check the current Steam description before buying for that feature.

  • Freshwater
  • Fish behaviour
  • Water quality
Platforms
Windows
Availability
Released
Visit Fish Game on Steam ↗
06
Small tank, gentle routine

Cozy Littlequarium

Fish care and breeding in a screen-bottom aquarium.

A compact aquarium that lives at the bottom of your screen. Care for fish, breed them, collect new arrivals and decorate their home. The format suits players who want to check in with a little living space throughout the day.

Choose it if breeding matters to you and you prefer a desktop companion to a full habitat view.

  • Desktop companion
  • Breeding
  • Decorating
Platforms
Windows
Availability
Released
Visit Cozy Littlequarium on Steam ↗
07
Build an underwater composition

FISHERY

Arranging a beautiful tank and watching it settle.

Build and maintain a stylized aquarium, arranging aquatic life and its surroundings into an underwater landscape. The appeal is in creating a scene, observing it and making small adjustments. Its Early Access status is worth checking alongside the latest development notes.

Choose it when the aquarium itself is your creative project.

  • Aquascaping
  • Sandbox
  • Stylized
Platforms
Windows
Availability
Early Access
Visit FISHERY on Steam ↗
08
A blank tank and a good idea

Aquarium Designer

Finding exactly the right place for a rock or plant.

Design and build aquariums, select their inhabitants and arrange the underwater scenery. It puts tank composition at the centre: layouts, plants and rocks become the work you come back to refine.

Choose it for aquarium design projects rather than a rare-fish collecting loop.

  • Tank design
  • Plants & rocks
  • Creative projects
Platforms
Windows
Availability
Released
Visit Aquarium Designer on Steam ↗
09
Think bigger than your own tank

Megaquarium

Planning exhibits, managing staff and welcoming visitors.

Design a public aquarium, choose its animals and organize the staff, equipment and exhibits that keep it running. Fishkeeping becomes a management game, with visitors and a growing operation to consider alongside the tanks.

Choose it when solving a bigger operational puzzle is how you like to unwind.

  • Management
  • Tycoon
  • Public aquarium
Platforms
Windows · macOS · Linux
Availability
Released
Visit Megaquarium on Steam ↗
10
A quieter place to return to

My Koi

Naming, feeding and watching koi at an unhurried pace.

Care for koi in a peaceful pond: name them, feed them and watch them grow. It keeps the focus close to the fish and their movement through the water, making it a lovely direction for players looking for a calmer fish-care experience.

Choose it for a pond and a small daily ritual rather than an elaborate aquarium economy.

  • Koi
  • Pond
  • Relaxing fish care
Platforms
Windows on Steam
Availability
Released
Visit My Koi on Steam ↗
Before you dive in

A few fishkeeping game questions

Which aquarium games focus on collecting fish?

Chillquarium centres on buying, raising and collecting fish, including rare colour variants. Tiny Aquarium adds a desktop companion and social features. ChillTank combines a fish and skin collection with breeding, individual progression and habitat decoration. Drawquarium takes a more creative direction by letting you draw inhabitants.

Which games let you breed fish?

ChillTank includes unlockable breeding, while Cozy Littlequarium also lists fish breeding. Fish Game lists breeding as planned; do not assume that every aquarium simulator already includes it. Check the current official listing for each game.

What is the difference between an idle aquarium game and an aquarium simulator?

Idle aquarium games tend to emphasize collecting and growth over time. Detailed simulators may focus more on water quality, fish behaviour or tank design. Desktop companions occupy a small part of your screen; management games such as Megaquarium add staff, exhibits and visitors.

Can I try ChillTank for free on Steam?

Yes. ChillTank has a free Steam demo for Windows, macOS and Linux. The full game is coming soon. Gameplay and saves are local, so optional Steam services do not block offline singleplayer play.