What is the 5 living organisms In a fish tank?

1. Fish: The most obvious living organism in a fish tank is the fish. There are many different types of fish that can be kept in a fish tank, including goldfish, guppies, tetras, and angelfish.

2. Plants: Plants are also an important part of a fish tank. They provide oxygen for the fish, help to filter the water, and provide hiding places for the fish. Some popular aquarium plants include anacharis, java fern, and Amazon sword.

3. Snails: Snails are often found in fish tanks as a way to help keep the tank clean. They eat algae and other organic matter that can build up in the tank. Some common types of aquarium snails include mystery snails, ramshorn snails, and nerite snails.

4. Shrimp: Shrimp are another type of invertebrate that can be kept in a fish tank. They are also a great way to help keep the tank clean, and they can provide a food source for some fish. Some popular types of aquarium shrimp include cherry shrimp, ghost shrimp, and amano shrimp.

5. Bacteria: Bacteria are essential for the health of a fish tank. They help to break down waste products and convert them into nutrients that can be used by the plants. There are many different types of bacteria that live in a fish tank, and they all play an important role in keeping the tank healthy.