My Ancient Fish Aquarium is a free Android simulation game designed for enthusiasts of ancient fish. The app features a diverse collection of 20 ancient fish species, including popular types like polypterus, gar pike, and stingrays. Players can manage up to five tanks, each housing four ancient fish, and customize their aquariums with various decorative elements such as plants, stones, and wallpapers. The game allows for individual growth of fish, enhancing the immersive experience of aquarium management.

In addition to aquarium customization, the app includes a unique fish shuffle game where players can acquire food and points by guessing the correct pond where a fish is hidden. This interactive feature adds a layer of challenge, rewarding players who answer correctly with bonus points. The feeding mechanic requires players to feed their fish every three days, ensuring that they remain engaged with the growth and upkeep of their aquatic pets.