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.