From keeping aquarium invertebrates for many years, I can say that there are so many different species to consider, and there is always something new to learn. As an aquarium enthusiast, I have come across many types of aquarium invertebrates, each with unique characteristics and requirements. In this guide, I will discuss some of the most common and popular types of aquarium invertebrates and each common species under that invertebrate.

What are Aquarium Invertebrates

Aquarium invertebrates can be broadly categorized into freshwater and marine invertebrates. Freshwater invertebrates are those creatures that thrive in non-saline water bodies, such as rivers, lakes, and, of course, freshwater aquariums. This group can include a variety of species, such as snails, crabs, and shrimp. 

The most common types found in the aquarium hobby include the Cherry Shrimp, Nerite Snails, and the fascinating Fiddler Crabs. These creatures not only add a visually interesting dimension to your aquarium but also contribute to the aquarium’s ecosystem by helping to maintain water quality and promoting the health of other aquatic life.

Types of aquarium invertebrates and their subspecies

Shrimp

As an aquarium enthusiast, I am endlessly fascinated by the incredible diversity of shrimp species that are available for aquariums. From the vibrant and colorful Red Cherry Shrimp to the delicate and graceful Crystal Red Shrimp, there is a large selection of varieties to choose from. 

These fascinating creatures not only add beauty to any aquarium, but they also play important roles in maintaining a healthy aquatic environment. Their scavenging habits help to keep the tank clean, while their intriguing behaviors provide endless entertainment for the observer. Here is a list of all the freshwater shrimp species

• Cherry Shrimp: Vibrant, active, ideal for beginners.
• Ghost Shrimp: Transparent, fascinating, helps in cleaning.
• Amano Shrimp: Hardy, algae-eating, large-sized.
• Bamboo Shrimp: Filter feeder, peaceful, interesting.
• Blue Tiger Shrimp: Striking blue stripes, exotic.
• Cardinal Shrimp: Eye-catching red hue.
• Crystal Red Shrimp: Graceful, delicate, high maintenance.
• Snowball Shrimp: Productive breeders, peaceful, small-sized.
• Vampire Shrimp: Large, blue hue, filter feeder.
• Sulawesi Shrimp: Unique, vivid colors.

Each species has its own unique characteristics, behavior, and care requirements, making them an interesting addition to any aquarium. 

Snails

These fascinating and diverse invertebrates come in a wide range of species, each possessing its own unique characteristics and adaptations. From the intricate patterns on their exoskeletons to the mesmerizing way they move, exploring the world of these incredible creatures is a journey full of wonder and discovery.

• Mystery Snail: Large, peaceful, enjoy veggies.
• Nerite Snail: Optimal algae eaters, hardy.
• Apple Snail: Big, plant-eating, colorful shells.
• Ramshorn Snail: Rapid breeders, small-sized.
• Malaysian Trumpet Snail: Nocturnal sand stirrers.
• Pond Snail: Hardy, fast breeders.
• Assassin Snail: Carnivore, beneficial pest control.
• Ivory Snail: Peaceful, plant-safe, large.
• Japanese Trapdoor Snail: Cold water tolerant, algae eater.
• Rabbit Snail: Unique, slow-breeding, leaf eaters.

Each species has its own distinct characteristics, such as size, coloration, and shell shape. Understanding the requirements of these snails, such as water parameters and diet, is crucial for their thriving in an aquarium setting.

Crabs

I will now introduce the various types of crabs that can be kept in an aquarium. These fascinating creatures come in a diverse range of shapes, sizes, and colors, each showcasing its own unique characteristics. From the vibrant red hues of the vampire crabs to the striking patterns of the Blue Leg Hermit Crab, there is a plethora of captivating options to choose from. Whether you prefer the bold and eye-catching appearance of the Thai micro crab or the delicate elegance of the Pom Pom Crab, there is a crab species to suit every aquarist’s taste and preference. 

• Red Claw Crabs: Semi-aquatic, brackish water dwellers.
• Fiddler Crabs: Notable large claw, semi-aquatic.
• Thai Micro Crabs: Small, peaceful, freshwater species.
• Panther Crabs: Fully aquatic, aggressive behavior.
• Vampire Crabs: Terrestrial, vibrant colors.

By adding these captivating crustaceans to your aquarium, you can create a vibrant and diverse underwater ecosystem that is sure to captivate and delight.

Crayfish

I find crayfish to be incredibly fascinating and diverse creatures. From their unique physical characteristics to their intriguing behavior, crayfish never fail to captivate the imagination. In aquariums, you’ll often come across popular species like the :

• Electric Blue Crayfish: Vibrant, active, freshwater dwelling.
• Dwarf Orange Crayfish: Small-size, peaceful, brightly colored.
• Red Claw Crayfish: Large, aggressive, nocturnal.
• Ghost Crayfish: Transparent, slow-moving, unique.
• White Specter Crayfish: Rare, captivating, peaceful.
• Procambarus Clarkii Crayfish: Hardy, adaptable, omnivorous.
• Marble Crayfish: Self-cloning, attractive, freshwater.

These aquatic inhabitants bring an extra dash of vibrancy and intrigue to any aquarium setting.

Mussels

Mussels are an often overlooked addition to freshwater aquariums. They are bivalve molluscs and can serve as a beneficial presence in your underwater community. Mussels are filter feeders, meaning they help to keep the water clean by filtering out microscopic organic matter. 

They require a substrate in which they can burrow and water parameters that mimic their natural habitat. However, hobbyists must ensure that mussels do not overpopulate their aquariums, as this can lead to them depleting the water of essential nutrients.

• Swan Mussel: Large filter feeder, sensitive to pollution.
• Duck Mussel: Freshwater, medium-sized, high care needed.
• Painter’s Mussel: Attractive, dynamic, prefers cooler water.
• Freshwater pearl mussel-: Spawns in the summer, likes clean water.
• Three-Ridge Mussel – Deep water dweller, may need an external filter.
• Pistolgrip Mussel-: Moderately hardy, not a fan of bright light.

Clams 

Freshwater clams, part of the bivalve family, are fascinating additions to aquariums. They contribute to the cleanliness of the tank by filtering out impurities. These peaceful creatures require sandy substrate for burrowing and a diet rich in fine particulate matter. 

• Asiatic Clam: Freshwater, filter-feeder, invasive species.
• Golden Clam: Tolerant, requires substrate for burrowing.
• Giant Floater: Large, North American native filter-feeder.
• Paper Pondshell: Lake inhabitant, sensitive to pollution.
• River Pigtoe: Endangered, freshwater, prefers slow currents.

Clams are known for their longevity, with some species being known to live up to 20 years. They make a unique addition to an aquarium, adding an element of elegance and intrigue.

Aquarium invertebrates come in a diverse range of shapes, sizes, and colors, making them a popular choice for aquarium enthusiasts. Whether you want to add some color and diversity to your tank or help maintain the overall health of your aquatic environment, an invertebrate species is sure to suit your needs. However, it’s essential to research each species’s specific care requirements before including them in your tank, as they can have varying needs.