- Fish now swim in schools — and they finally stay level - 30 August 2026
This update is all about how the fish move. Schooling Fish of the same species now swim together. Each school follows a leader and holds its formation instead of drifting apart, so a tank full of neons reads as one shoal rather than twenty separate fish. Formations spread out in depth as well as side to side, so a large school fills the tank naturally instead of stacking into a single flat band. Bodies that stay level Fish no longer tip their heads up or down when they swim vertically. Bodies stay parallel to the floor at all times. The old tilt made a fish rising to the surface look like it was standing on its tail. New squash-and-stretch motion replaces it. Bodies compress and extend in time with the tail beat, so you can still read the burst-and-glide rhythm at a glance — just without the nose in the air. Pacing Cruising speed now drifts gently up and down instead of holding one flat…
- Gold overflow fix, 36 new decorations, and fish that swim behind your decor - 30 August 2026
Fixed Gold no longer breaks past 2.1 billion. Any balance above 2,147,483,647 wrapped around into a negative number, and restarting the game reset it to zero. Gold is now stored as a 64-bit value, so that ceiling is gone. If your save already went negative, it is repaired automatically the next time you load — you get the exact amount back, not a rounded guess. Selling a full collection stack paid far too little. A stack's total was capped at 2.14 billion gold, so most of its value quietly disappeared. You are now paid the full amount. New 36 new late-game decorations — 161 in total. Sunken cabins and temple ruins, a shipwreck with treasure and cannons, a sphinx and a fallen obelisk, lava rock and amethyst, torii gates and pagodas, and a few oddities: a mushroom house, a yellow submarine, a red telephone box. They unlock from level 126 to level 161. Cure All. A button appears whenever f…
- Every Fish Now Speaks Your Language - 19 August 2026
Localization update The 125 collection fish added in the last update had their descriptions written only in English. Now every one of them is described in all 23 supported languages, the same as the original 125 species. 2,875 fish descriptions, covering the full catalogue of 250 species. Nothing else changed — no balance, no prices, no save data. If you play in anything other than English, open any collection fish and you will see its description in your own language.
- Collection Fish & Fish Packs — 125 New Species - 19 August 2026
125 New Collection Fish The store now has a separate Collection tab with 125 showcase species, bringing the catalogue to 250 fish in total. They exist for one reason: to give your late-game gold somewhere to go. A collection fish arrives fully grown — no egg, no waiting. They never grow, never eat, never fall sick and never breed. There is nothing to look after. They still take up tank space, and they sell back for exactly what you paid — a collection fish parks your gold rather than growing it. Buying the same one again does not add a second fish: the one in your tank becomes 2x, keeps its name, and takes no extra space. You can name them and sell them individually. Sell All never touches them. Their detail panel switches to a gold theme, so a rare fish is obvious at a glance. The Showcase tank holds 125 fish and needs no care at all — the natural home for a collection. Fish Packs Eigh…
- Sell All, Name Your Fish & a Cleaner UI - 17 August 2026
This update is about cutting down the busywork and tidying up the interface. Sell All A new Sell All button appears in the bottom bar whenever you have grown fish ready to go. One click sells every grown, unlocked fish, and it tells you how many and how much before it does anything. Locked fish are never touched. Name your fish Click any fish and you can give it a name. Naming a fish locks it automatically, so your favourites can't be swept up by Sell All or a stray Shift-click. Unlock it whenever you like and it becomes sellable again — the name stays. The game now follows your Steam language On first launch the game uses the language you picked for it in Steam, then falls back to your system language. If you already chose a language in-game, nothing changes — your choice is never overwritten. Spanish (Spain) and Brazilian Portuguese are now listed as supported languages too. A tidier…
- Fish Health Fix: Cures Now Work, and Sickness Takes 7 Days - 2 August 2026
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 - 1 August 2026
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…
- The Multi-Tank Update — 4 aquariums, offline earnings, weekly goals - 30 July 2026
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…
- The Living Aquarium Update — 125 Fish, Collections, Rewards & More - 29 July 2026
This is our largest update yet! ARC Aquarium has been expanded with 125 fish species, a permanent collection catalog, new rewards, achievements, redesigned menus, improved performance, and many quality-of-life features.## 125 Fish to Discover- Expanded the aquarium from 85 to 125 unique freshwater and saltwater fish species.- Added individual names, descriptions, prices, growth values, and unlock requirements for every fish.- Reworked the store so the complete fish catalog loads and displays reliably.- Added a permanent Collection catalog that records every species you discover.- Undiscovered fish remain locked in the catalog without revealing their details.- Added the ability to lock favorite fish.- Locked fish cannot be sold through the detail panel or by Shift-clicking.- Improved fish artwork and font support across the complete catalog.## Breeding, Progression, and Rewards- Improved…
- Smarter Feeding, Decor Income & UI Customization - 4 July 2026
Patch Notes Gameplay Feeding behavior improved: Only hungry fish near the food swim toward it, instead of the entire tank rushing at once. Right-click to feed: Hold the right mouse button to drop food (documented in How to Play). Decor Decor passive gold: Placed decor earns gold every 10 minutes while the game is running. Visual feedback: Floating gold text and a status panel when selecting decor. Progress tracking: Decor gold timers are saved and restored. UI & Settings UI theme customization: Adjust accent color and panel transparency from Settings. Runtime theme support: UI updates apply immediately across panels, buttons, and store items. Layout and styling polish for store, panels, and bottom bar. How to Play All 23 languages updated with full How to Play text. Added details for: right-click feeding, nearby-fish behavior, passive income, offline progress, disease, breeding, control…
- bug fix - 30 June 2026
bug fix
- UI Overhaul & Smoother Fish Swimming - 29 June 2026
This update gives the game a cleaner, more modern look and improves how your fish move. User Interface - Redesigned the entire UI with a refreshed color palette and consistent, modern styling. - New compact info panel (level, money, EXP, tank capacity) that takes up less space and is easier to read. - Reworked the fish detail panel: action buttons now stack neatly with no empty gaps. - Cleaned up the Store, Settings, and How to Play menus for a more professional feel. - Bottom menu buttons now use clear text labels instead of icons (fully localized). - Fixed the language dropdown so the options are now clearly readable. Gameplay - Replaced the old jittery fish animation with a smooth, natural swimming motion. Fish now gently glide and tilt as they swim up and down. Thanks for playing!
- Patch Notes - 22 February 2026
Audio New background music tracks have been added. UI & localization A “How to Play” screen has been added. You can open it by clicking the question mark (?) button shown below.
- Patch Notes - 21 February 2026
Gameplay Fish death removed – Fish can no longer die from sickness. Sick fish stay sick until cured. Decor passive income – Decors now give passive gold while the game is open. Amount is based on the decor’s required level (e.g. level 3 = 3 gold/hour). Does not apply when the game is closed. Offline EXP limit – Offline EXP cap reduced from 30 days to 1 day. Fixes Fish EXP bug – Resolved an issue where fish sometimes did not gain EXP after loading the game. Fish EXP reset – Fixed a save/load race condition that could reset some fish to 0 EXP. Code cleanup – Removed an unused variable that triggered a compiler warning. UI & Localization Decor passive gold text – Each decor in the store now shows its hourly passive gold income. Translations – Added the passive gold text to all 23 supported languages. Technical Save system – Improved save/load order to avoid overwriting fish data with an em…
- Major Update - 1 February 2026
Breeding feature has been added to fish. When female fish are fully mature and there is a male fish of the same species, breeding buttons will now appear. You can breed once every 24 hours and get eggs of the same fish species. You must have at least one empty space in your aquarium for breeding. Each egg takes up 1 space in the aquarium.Now when you buy a fish, instead of a fish directly, an egg will drop into the aquarium and you will wait for the egg to hatch. The time will be slightly longer for higher level fish.Fish hatched from eggs will have a random gender. All your existing fish will remain male.If you experience problems with the save system, press the "reset game" button from the settings button. We don't expect this to happen, but we don't want any problems in your gameplay. If you experience a problem, this will be the best thing to do.Adult fish will now provide you with…
- UI and Small Changes - 31 January 2026
Hello dear aquarium enthusiasts,Changes made;The feed button has been removed. You can now feed by right-clicking anywhere you want. You can hold the right mouse button. Food is now free and unlimited.Level-required items in the store will now appear locked. (Done to create curiosity.)The game can now run in the background.New sound effects and settings have been added. Purchase and sale sounds have been added. We're not adding too many sounds to avoid disrupting the relaxing atmosphere.Most importantly, the entire UI has been changed to a softer structure.Menu button positions and colors have been slightly changed.Updates will continue. Keep making requests in the comments.
- New features will come - 24 January 2026
Now your aquarium can get dirty. Features you didn't see in the trailer await you. The game will continue to be developed. Features planned for future additions:Ability to rotate decorations left and right.Adding sound and sound settings to the game.Fish will be able to get sick and you will be able to treat them.Rewards will be unlocked based on your playtime.Automatic feeding and automatic cleaning may be added.A "How to play?" screen will be added.
