Fish Simulator In this game, you can feed your fish, help them grow, and sell them to earn money. With the money you earn, you can feed even more special fish and even engage in trading with your friends. As you progress, you can become a leader in the fish industry and compete with other players. Feeding Fish: Increase the happiness of your fish by feeding them at regular intervals. Aquarium Water Parameters: The water parameters in your aquarium affect the breeding of fish. As you improve the water quality, more fish will reproduce. You can test the water parameters and use additives to raise any values that are low.