Invertebrates

5 cm Peaceful

A highly popular, industrious freshwater shrimp renowned for its unmatched algae-eating abilities. Popularized by aquascaper Takashi Amano, they are significantly larger and hardier than most dwarf shrimp (like Cherry Shrimp). They are notorious food-thieves during feeding time and excellent escape artists, requiring a tight-fitting lid. Their larvae require saltwater to develop, so they will not overpopulate in a freshwater aquarium.

American Grass Shrimp

Palaemonetes kadiakensis

4.5 cm Peaceful

A completely freshwater shrimp native to North America. Often sold interchangeably with Ghost Shrimp (P. paludosus), the American Grass Shrimp is hardier, breeds more easily in entirely freshwater, and is an excellent, active scavenger for community tanks. They have a completely transparent body and prefer planted aquariums.

Apple Snail

Pomacea maculata

15 cm Peaceful

One of the largest freshwater snails in the world, capable of reaching the size of a baseball or larger. Unlike the popular 'Mystery Snail' (Pomacea bridgesii) which is generally plant-safe, Pomacea maculata is a voracious herbivore that will systematically devour almost any live aquarium plant. They require heavy filtration due to their massive waste output and hard, calcium-rich water to prevent shell deterioration.

Assassin Snail

Anentome helena

A highly effective and popular carnivorous freshwater snail used primarily for pest snail control. They actively hunt and consume smaller snails like bladder, ramshorn, and pond snails. Featuring a striking yellow and dark brown spiraled shell, they are a functional and attractive addition to aquariums. Unlike many aquatic snails, they are not hermaphroditic and reproduce quite slowly.

Bamboo Shrimp

Atyopsis moluccensis

10 cm Peaceful

A large, completely peaceful freshwater filter-feeding shrimp. They use specialized fan-like appendages to catch microorganisms and fine food particles from the water column. They require an established aquarium with moderate to high water flow and tall resting places (like driftwood) directly in the current.

Bee Shrimp

Caridina logemanni

A highly prized dwarf freshwater shrimp known for its striking opaque color bands. Native to streams in Southern China, they require specific parameters to thrive: cool, highly oxygenated, acidic, and very soft water. This is usually achieved using RO (Reverse Osmosis) water remineralized with specific shrimp salts and active buffering soil. They are highly sensitive to nitrogen spikes and copper, and are extremely vulnerable to fish predation.

Bee Shrimp (Crystal Red / Black)

Caridina cantonensis

A sensitive, highly prized dwarf shrimp species known for its vivid red/white or black/white banding. Unlike the hardy Cherry Shrimp (Neocaridina), Bee Shrimp require cool, soft, acidic water and typically require active buffering soil to thrive. They are peaceful grazers perfect for specific biotope setups.

Bladder Snail (Pest Snail)

Physella acuta

1.5 cm Peaceful

A tiny, fast-moving freshwater snail almost universally introduced accidentally via live aquarium plants. While frequently labeled a 'pest' due to their rapid, prolific reproduction, they are actually an excellent cleanup crew. They consume algae, uneaten food, and decaying plant matter without harming healthy plants. They are hermaphroditic and can self-fertilize, meaning a single snail can start a massive colony.

Blue Pearl Shrimp

Neocaridina zhangjiajiensis

A hardy, peaceful dwarf shrimp species closely related to the popular Cherry Shrimp. They are excellent scavengers that constantly graze on biofilm and algae. Due to their tiny size, they are extremely vulnerable to predation and are best kept in dedicated invertebrate setups or with very small, peaceful nano fish (like rasboras).

Brown Camo Shrimp

Caridina babaulti var. Brown

The Brown Camo Shrimp (Caridina babaulti) is a fascinating dwarf shrimp known for its ability to rapidly change color to match its surroundings, much like a chameleon. They are excellent scavengers and algae grazers. Unlike some highly sensitive Caridina species (like Crystal Reds), Babaulti are relatively hardy and can adapt to a wider range of water parameters, making them a great choice for planted nano tanks.

Cardinal Shrimp (Sulawesi)

Caridina dennerli

2 cm Peaceful

A stunning but highly sensitive dwarf shrimp native to the ancient Lake Matano in Sulawesi, Indonesia. Famous for its bright red coloration and contrasting white front appendages (often called 'white gloves'). They require extremely specific, pristine water conditions (high temperature, high pH, specific remineralizers) and are only recommended for advanced aquarists.

Cherry Shrimp

Neocaridina davidi

One of the most popular and hardy freshwater invertebrates in the hobby. They come in a rainbow of selectively bred colors. They are excellent scavengers and algae eaters, perfect for nano planted tanks. They are completely peaceful and have a negligible bioload, though they are highly vulnerable to predation by almost any fish with a mouth large enough to eat them.

Electric Blue Crayfish

Procambarus alleni

12 cm Aggressive

A highly active, aggressively opportunistic crustacean native to Florida. Famous for its striking blue color mutation in the aquarium trade. They are notorious plant destroyers, escape artists, and will actively hunt any fish or invertebrate they can catch. Must be kept with a tight-fitting lid.

Fiddler Crab (Brackish)

Uca sp.

5 cm Mostly Peaceful

Fiddler Crabs are semi-terrestrial invertebrates that absolutely require a specialized tank (paludarium) with access to dry land. They CANNOT survive fully submerged and will drown. Furthermore, they require brackish water for long-term survival, despite often being incorrectly sold as freshwater pets. They are social, highly active scavengers.

Freshwater Harlequin Shrimp (Sulawesi)

Caridina cf. spongicola

1.5 cm Peaceful

An expert-level, tiny freshwater shrimp endemic to Lake Towuti in Sulawesi. Known for its striking red and white bands and shy nature. In the wild, they live symbiotically with a specific freshwater sponge, though in aquariums they can be sustained on mature biofilm. They require extremely stable, warm, alkaline water parameters and should only be kept by advanced aquarists.

Ghost Shrimp

Palaemonetes paludosus

4 cm Peaceful

A completely transparent freshwater shrimp native to the southeastern United States. While frequently sold as inexpensive feeder animals, they make fascinating, active scavengers for nano and peaceful community tanks. They tirelessly consume uneaten food and detritus but have a relatively short lifespan of 1 to 2 years.

Horned Nerite Snail

Clithon corona

1.5 cm Peaceful

A highly effective and tiny algae-eating snail characterized by the horn-like spikes on its shell. It is completely peaceful and will not reproduce in freshwater (though it may lay unsightly white eggs on decor). It requires an established tank with plenty of algae and hard, alkaline water to prevent shell erosion. Known to climb out of aquariums if a lid is not secure.

Malaya Shrimp

Caridina sp. "Malaya"

A unique and highly variable dwarf shrimp native to Southeast Asia. Unlike most dwarf shrimp, Malaya Shrimp are a low-order species, meaning their eggs hatch into tiny larvae rather than fully-formed shrimplets. However, unlike Amano Shrimp, these larvae do not require saltwater or brackish conditions; they metamorphose completely in freshwater. They are peaceful, active scavengers and excellent algae eaters that come in a wide array of colors including red, blue, green, brown, and clear.

Malaysian Trumpet Snail (MTS)

Melanoides tuberculata

The Malaysian Trumpet Snail is a highly beneficial, albeit prolific, freshwater invertebrate. They are famous for burrowing deep into the substrate during the day, which prevents toxic anaerobic gas pockets and aerates plant roots. They emerge at night to scavenge for detritus, algae, and uneaten food. They reproduce via parthenogenesis, meaning a single snail can quickly clone itself to start a colony.

Mexican Dwarf Crayfish (CPO)

Cambarellus patzcuarensis

5 cm Mostly Peaceful

A highly entertaining, fully aquatic dwarf crayfish. In the aquarium trade, the bright orange 'CPO' morph is the most popular. Unlike larger crayfish, they are generally safe with plants and fast-moving mid-to-top dwelling fish. However, they are opportunistic omnivores with claws; they will hunt dwarf shrimp and may nip the fins of slow, long-finned bottom dwellers.

Mystery Snail

Pomacea bridgesii

5 cm Peaceful

A large, popular, and active freshwater snail. Unlike other apple snails, they generally do not eat live, healthy plants, preferring algae, detritus, and sinking foods. They require calcium-rich, alkaline water to prevent shell erosion. Females will frequently leave the water to lay distinct pink egg clutches above the waterline.

Nerite Snail

Neritina natalensis

The gold standard for algae control in freshwater aquariums. Native to Africa, these snails are renowned for their voracious appetite for diatoms and spot algae. A key feature is their inability to breed in freshwater; they lay white sesame-seed-like eggs that will not hatch without brackish/marine conditions, preventing population explosions. They are escapists and require a tight-fitting lid.

Ninja Shrimp

Caridina serratirostris

The Ninja Shrimp is a fascinating, completely peaceful dwarf shrimp named for its rapid, darting movements and unique ability to quickly change color (from black and brown to red, blue, or translucent) to camouflage with its surroundings. Unlike Neocaridina, their larvae require brackish water to survive, meaning they will not reproduce and overpopulate a freshwater aquarium.

Olive Nerite Snail

Neritina reclivata