Fish Tank Simulator

Fish Tank Simulator is an idle aquarium game about making choices and building efficient setups. You buy fish packs and place fish in detailed tanks, then decide how to grow your aquarium. Progress continues whether you check in often or leave the game running.

Grow your aquarium

You can feed low-rarity fish with upgraded food to help them grow quickly, or remove lower-rarity fish until a tank contains only high-rarity fish. Fully grown fish generate income while you are away, and you can manage multiple tanks.

Develop new regions

As you earn money, you construct key buildings to improve each area. These projects reshape the environment, help fill your fish collection and prepare you to move to regions with new conditions and species. You start in a quiet forest, where your first long-term goal is to build a communication tower. Completing it marks your readiness to move on; the description also mentions a future frozen biome with species that cannot survive elsewhere.