Explore our growing database of freshwater fish species. Each profile includes detailed care requirements, compatibility data, and environmental needs to help you build the perfect aquarium.
Boraras maculatus
A tiny, peaceful shoaling fish native to the blackwater streams and peat swamps of Southeast Asia. Known for their striking red/orange coloration and distinct dark body spots. They are an excellent choice for heavily planted nano tanks and peaceful dwarf shrimp setups. Because of their minute size, they are easily outcompeted for food and predated upon by larger fish.
Melanotaenia splendida
An active, schooling species native to Australia, highly variable in color depending on the catch location. They are fast swimmers that require long tanks with ample open swimming space. Because of their energetic feeding behavior, they can outcompete shy or slow-moving fish. Best kept in shoals to display natural morning sparring and courtship behaviors.
Procambarus alleni
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.
Sciaenochromis fryeri
The Electric Blue Hap is a striking Lake Malawi cichlid. In the wild, they are specialized piscivores that hunt the fry of other cichlids among the rocks. Due to extreme sexual dimorphism, mature males develop a brilliant metallic blue coloration, while females remain a drab silver-brown. They are best kept in a large, hard-water aquarium either as a single showpiece male in an 'all-male' Hap/Peacock display, or as a single male with a harem of multiple females.
Pseudotropheus johannii
An iconic Mbuna cichlid from Lake Malawi renowned for extreme sexual dimorphism. Males transform into a striking electric blue with dark navy horizontal stripes, while females and juveniles remain a vibrant yellow-orange. Like most Mbuna, they are highly aggressive, territorial, and require hard, alkaline water with extensive rockwork to form caves. They are avid diggers and will destroy most live plants.
Chindongo elongatus
The Elongatus Cichlid is a highly active, slender mbuna endemic to Lake Malawi. Formerly classified as Pseudotropheus elongatus, it is notorious for being one of the most aggressive and territorial of all mbuna. They require a strictly herbivorous diet (grazing on algae/aufwuchs) and a large aquarium heavily decorated with rocks to break sightlines. Due to extreme conspecific aggression, they are best kept in harems (1 male to 4+ females) or in a carefully planned, overstocked mixed-species mbuna tank.
Hyphessobrycon amandae
The Ember Tetra is a striking, fiery orange-red nano fish native to the Araguaia River basin in Brazil. Extremely peaceful and active, they are perfect for planted and blackwater aquariums. They are tight schoolers and must be kept in groups to feel secure and display their best colors.
Danio erythromicron
An exquisite, tiny cyprinid endemic to Lake Inle in Myanmar. Known for their striking emerald vertical bands and reddish-orange fins. Because they originate from a slightly alkaline mountain lake, they prefer cooler, harder water than many tropical fish. They are notoriously shy and must be kept in schools in heavily planted tanks with broken sightlines to feel secure.
Brevibora dorsiocellata
A small, active schooling fish native to Southeast Asia, famous for the striking black-and-white spot on its dorsal fin and its reflective 'emerald' eyes. They are highly peaceful and thrive in heavily planted or blackwater aquariums. As a strict schooling species, they must be kept in groups to feel secure, establish a natural hierarchy, and display their best colors.
Corydoras splendens
Formerly classified as Brochis splendens, the Emerald Green Cory is significantly larger, taller, and chunkier than typical Corydoras. Known for their striking metallic emerald green and blue sheen, they are highly social, peaceful bottom-dwellers. They must be kept in groups and require a soft sand substrate to protect their delicate sensory barbels from erosion.
Channa marulioides
The Emperor Snakehead is a massive, highly predatory oddball native to the rivers and lakes of Southeast Asia. Known for striking adult coloration featuring bright orange rosettes (flowers) along their flanks, they are top-tier monster fish. They are obligate air-breathers (requiring access to the surface) and incredibly strong jumpers. Due to their massive adult size and highly aggressive nature, they require specialized, enormous aquariums and should only be kept by experienced monster fish keepers.
Nematobrycon palmeri
A striking, robust schooling fish from Colombia. Unlike many tetras, they do not swim in a tight shoal, preferring to loosely associate while males stake out small territories to display to females. They feature a bold black lateral line and iridescent purple/blue hues.
Hypseleotris compressa
A remarkably adaptable and beautifully colored sleeper goby (not a true goby) native to Australia and New Guinea. They inhabit both pure freshwater streams and brackish estuaries. While generally peaceful and excellent community fish, they are micropredators that will happily consume dwarf shrimp and very small fry.
Poecilia wingei
A tiny, vibrant, and highly active livebearer closely related to the Guppy. Males display intense, neon colors and patterns, while females are larger and plainly colored. They are prolific breeders and require hard, alkaline water to thrive.
Trigonostigma espei
A small, peaceful schooling fish native to Southeast Asia. Closely related to the Harlequin Rasbora but distinguished by a more copper-orange coloration and a thinner, 'lambchop' shaped black marking on its flank. They thrive in heavily planted, mature aquariums with gentle water flow and slightly acidic water.
Melanotaenia exquisita
A highly active, schooling species native to the fast-flowing, clear streams of Australia's Northern Territory. True to their name, they display stunning metallic bodies with bright red-tipped fins. They require pristine, well-oxygenated water, plenty of horizontal swimming space, and should always be kept in groups of 6 or more.
Tetraodon lineatus
A massive, highly intelligent, and extremely aggressive freshwater pufferfish native to the Nile, Senegal, and Niger rivers. Often referred to as 'water dogs' due to their owner recognition and begging behavior. They are strictly solitary pets that will relentlessly attack and kill any tank mates. They require a diet of hard-shelled invertebrates to keep their ever-growing teeth trimmed.
Neolamprologus brichardi
An elegant but fiercely territorial Lake Tanganyika cichlid. They are famous for their complex social structure, forming massive, multi-generational colonies where older siblings help defend and raise new fry. Due to their extreme territoriality when breeding, they are best kept in a species-only tank, as they will aggressively eliminate non-colony tank mates.
Kryptopterus macrocephalus
A fascinating, semi-transparent schooling catfish from Southeast Asia. Unlike the more common Ghost Catfish, this species has distinct stripes or mottling along its body. They are incredibly peaceful but timid, requiring heavily planted blackwater setups with dim lighting and a large shoal to feel secure.
Petitella georgiae
A small, peaceful, and highly active schooling fish known for its bright red snout and black-and-white striped tail. Often confused with the True Rummy-Nose (Hemigrammus rhodostomus) or Firehead Tetra (Hemigrammus bleheri), the 'False' Rummy-Nose is distinguished by red coloration that typically does not extend past the gills. They are excellent indicator fish; their red noses will pale if water quality drops. They require ample horizontal swimming space and pristine water conditions.
Garra cambodgiensis
A cyprinid native to fast-flowing streams in Southeast Asia. It is notoriously sold misidentified as the true Siamese Algae Eater (Crossocheilus oblongus). Unlike the true SAE, its black lateral stripe stops at the base of the tail fin rather than extending through it, and it features a yellowish stripe above the black line. It is an excellent biofilm grazer but does not eat Black Beard Algae as effectively. They require highly oxygenated water and become very territorial with conspecifics as they age.
Cyathopharynx furcifer
A spectacular Lake Tanganyika cichlid known for its dramatic sexual dimorphism. Males display brilliant metallic hues (blues, greens, or coppers depending on collection point) and possess sweeping, elongated pelvic 'feather' fins. Males build enormous crater-like sand bowers to attract females. Because of this bower-building behavior and their high activity level, footprint (length and width) is far more critical than tank height.
Synodontis eupterus
A striking, large African catfish known for its spectacular, fan-like dorsal fin and its ability to produce a 'squeaking' sound when distressed or asserting dominance. While generally peaceful with similarly sized tank mates, it is highly territorial over its chosen cave and will predate on small fish at night.
Mesonauta festivus
A peaceful, deep-bodied South American cichlid that makes a great, hardier alternative to the Discus or a peaceful companion for Angelfish. They feature a distinct black diagonal band running from their mouth to the top of their dorsal fin. They are an inquisitive species that often look up towards the surface, but they are notorious for eating soft aquarium plants.
