Create, customize, and manage your own aquarium in a relaxing 2D idle simulation.
ARC Aquarium is a cozy aquarium management game where you collect fish, decorate your tank, and watch your aquarium grow over time — even while you're away. Feed your fish, clean the tank, unlock new content, and enjoy calm progression at your own pace.
Whether you play actively or check in from time to time, your aquarium is always alive.
Collect and Grow Your Fish
Collect 85 unique fish species, each with its own visuals, price, and level requirement
Feed your fish to help them gain EXP and grow visually
Fish continue growing over time with idle and offline progression
Watch natural swimming animations, tail movements, and bubble effects
Decorate Your Aquarium
Unlock and place 86 different decorations
Move, resize, and sell decorations freely
Customize the depth and layout with smooth layering and visual sorting
Change the look of your aquarium with 9 different backgrounds
Relaxing Progression System
Level up by earning EXP and unlock new fish, decorations, and backgrounds
Manage tank capacity as you progress
Earn money by growing and selling fish or decorations
Simple economy designed for calm, stress-free gameplay
Keep Your Aquarium Clean
Dirt appears over time, even while the game is closed
Click to clean dirt and earn bonus EXP
Adds a light interactive element without breaking the relaxing flow
Idle & Offline Friendly
Your aquarium continues progressing while you're offline
Fish gain EXP automatically over time
Dirt appears based on real elapsed time
Come back anytime and see how your aquarium has grown
Global-Friendly Experience
Supports 23 languages, fully localized UI
Automatic save system — your progress is always safe
Simple controls and accessible gameplay for all ages
Designed to Be Calm
ARC Aquarium is designed to be a peaceful experience.
No time pressure, no failure states — just gentle progression, soothing visuals, and the joy of watching your aquarium come to life.
Play actively or let it run in the background.
Your aquarium grows at your pace.
