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ARC Aquarium

ARC Aquarium

by ACA Games

★ 100%
Price $2.99
Avg Players 1
Reviews 14
Released Jan 30, 2026
CasualClickerFishingIdler
Offline progress
View on Steam ↗

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Construct a thriving aquarium by collecting diverse fish species while managing tank upkeep and earning currency for upgrades and decorations. The game combines light management tasks like feeding and cleaning with idle progression mechanics, letting you expand your collection passively. Best suited for players seeking a low-stress, meditative experience rather than challenging gameplay.

About this game

What players are saying

▲ Recommended 10 hrs
ARC Aquarium delivers a peaceful idle simulation that revolves around creating and nurturing a thriving virtual aquarium. Instead of emphasizing fast-paced gameplay or demanding management systems, it focuses on slow, rewarding progression that allows players to enjoy building a colorful underwater habitat at their own pace. The game's straightforward design makes it approachable for newcomers while still offering enough long-term goals to keep fans of idle games engaged. Every session feels calm and inviting, making it an ideal title for players looking to unwind rather than chase high-pressure objectives.

The game's strongest feature is its steadily expanding collection of aquatic life. Players can unlock dozens of different fish species, each with its own appearance, growth cycle, and contribution to the aquarium's economy. Feeding fish helps them gain experience and mature, creating a satisfying sense of progression as the once modest tank gradually transforms into a lively aquatic showcase. Watching the fish swim naturally throughout the environment adds personality to the aquarium, while the idle mechanics ensure that progress continues even when the game is closed. This balance between active participation and passive advancement makes returning to the game consistently rewarding without ever feeling like a chore.

Customization is another major highlight, allowing players to shape the aquarium according to their own preferences. A wide variety of decorative items and multiple background themes provide numerous opportunities to create unique underwater displays. Decorations can be repositioned, resized, or replaced whenever inspiration strikes, encouraging experimentation instead of locking players into permanent decisions. The freedom to redesign the aquarium over time helps maintain long-term interest, as players can continually refresh the appearance of their aquatic world while unlocking additional decorative options through progression.

The gameplay loop remains intentionally simple yet effective. Fish generate income that can be reinvested into purchasing new species, expanding the aquarium, or acquiring decorative upgrades. Regular maintenance tasks such as feeding fish and cleaning the tank introduce just enough interaction to keep players involved without disrupting the game's relaxing pace. Dirt accumulation encourages occasional check-ins, while cleaning rewards additional experience instead of feeling like a punishment. This design philosophy reinforces the title's casual nature, making every interaction feel meaningful while avoiding the frustration often associated with more demanding simulation games.

Visually, ARC Aquarium succeeds through its bright art direction and pleasant animations rather than technical complexity. Fish move smoothly through the water, decorative objects help create depth, and subtle visual effects make the aquarium feel alive. Combined with its soothing soundtrack, the presentation creates an atmosphere that complements the idle gameplay exceptionally well. The game's modest system requirements also make it accessible to a broad audience, ensuring that players can leave it running in the background without placing significant demands on their hardware.

Although the experience may lack the complexity and strategic depth found in larger aquarium management simulators, its simplicity is also one of its greatest strengths. The game never overwhelms players with unnecessary systems, instead choosing to provide a comfortable and relaxing progression loop built around collecting fish, decorating aquariums, and gradually expanding a thriving underwater environment. Players seeking intense management challenges may find it too light, but anyone looking for a cozy idle experience with satisfying customization and consistent progression will likely find plenty to enjoy. ARC Aquarium understands its audience well and delivers a charming simulation that remains enjoyable through its relaxing pace and welcoming design.

Rating: 7/10
3 found helpful Steam ↗

Reviews are by Steam users, hosted on Steam.

Latest updates

Fish Health Fix: Cures Now Work, and Sickness Takes 7 Days

4 days ago
Fixed cures not working: a cured fish now stays healthy instead of falling sick again seconds later. Fish now need 7 days without food to get sick, up from 24 hours, and time spent in a background tank no longer counts against them. Fish that are currently sick under the new limit heal themselves automatically.

125 New Decorations, Steam Achievements & a Critical Save Fix

4 days ago
125 new decorations The decoration catalogue has been rebuilt from the ground up. The old 86 decorations are gone, replaced by 125 hand-drawn aquatic species — freshwater plants, seagrasses, macroalgae, hard corals, LPS and soft corals, each with its real name in the shop. Your existing decorations will look different. They keep their spot, their size and their earnings, but the artwork underneath them is new. Nothing was removed from your tank. One new decoration unlocks at every level, all the way to 120 Prices now run from 10 gold to 1,500,000 gold, so there is finally something worth saving for late game Every decoration you already own earns at least as much gold as it did before — no income was reduced The most expensive decorations pay back slowly on purpose. They are a way to spend gold, not a money printer 26 Steam Achievements Achievements are now real Steam achievements with their own icons. If you have already met the requirements, they unlock the moment you launch this update — collection milestones, gold, levels, breeding, cleaning and feeding are all counted from your existing save. Expect a burst of notifications on your first launch. Achievement icons now also appear in the in-game achievements panel and in the unlock notification. Fixes Your save could be erased if the game closed before it finished loading. The game now refuses to write over a save it has not read yet. This is the most important fix in this update. The "while you were away" report could be overwritten by another pop-up before you had a chance to read it. Notifications now wait their turn instead of replacing each other. "Breed now" could do nothing at all with no explanation. It now tells you exactly what is missing — usually a male of the same species, or one that is still growing up. Decoration names are now shown in the shop, and fish and decoration names have an outline so they stay readable over bright artwork. Localisation The new breeding messages and the next-unlock hint a...

The Multi-Tank Update — 4 aquariums, offline earnings, weekly goals

6 days ago
The Multi-Tank Update Your aquarium just became four aquariums. This update adds multiple tanks, offline earnings, weekly goals, booster packs and 14 new backgrounds — plus a rebuilt progression curve so the full collection lasts. Multiple Aquariums Unlock up to 4 separate tanks from the new Tanks tab in the store Each tank keeps its own fish, decorations and background Switch between tanks instantly from the bottom bar Move fish and decorations between tanks whenever you like Each tank has its own fish capacity, so a new tank genuinely means more fish The Showcase tank is a display case: it holds your whole collection, and fish there never get hungry or sick and it never gets dirty Offline Earnings Your decorations now keep earning while the game is closed. Come back to a "Welcome back" summary showing what you made. Previously, being away only meant hungry fish and a dirty tank — now there is something waiting for you. Booster Packs Two packs — Freshwater and Reef — each give 3 random fish for less than buying them one by one. Species you have not discovered yet are more likely to appear, so packs help complete the collection instead of handing you duplicates. Daily & Weekly Quests Three small daily goals and one weekly goal, shown in the top-right corner. They reward EXP, and there is no streak to lose — miss a day and nothing breaks. The list hides itself once everything is done. Fish of the Week Every week one species is featured and sells for +75% once fully grown. The same fish is featured for everyone, so it is worth comparing notes. 14 New Backgrounds The background collection grows from 9 to 23, and all of the existing artwork has been redrawn at full resolution. Share Your Aquarium Upload a screenshot of your aquarium to the Steam screenshots section. The nicest 5-10 aquariums, chosen by players and by us, will be added to a "Best Aquariums" gallery inside the game, credited to whoever built them. Progression Rebalanced We simulated thousands of playthrou...

Posts come from Steam's official announcements feed.

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