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Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 337 species
Blue discus
Symphysodon aequifasciatus
This is one of the classic wild discus from the Amazon-big, round, and super "cichlid-smart," but way more chill than most cichlids. The coolest part to me is the parenting: the fry actually feed off a mucus layer from the parents' skin for a while, which is just wild to see if you ever breed them.
Blue dorsal Borneo sucker
Gastromyzon ctenocephalus
This is one of the little Borneo hillstream loaches that scoots around like a tiny living suction cup, spending most of its day grazing on biofilm off smooth rocks. The cool part is the fin patterning - the caudal fin has bold pale-blue striping, and they do those quick little territorial "flaring" displays with each other without usually doing real damage. Keep it in a high-oxygen, high-flow setup and it just settles in and does its thing.
Blue sheatfish
Kryptopterus cryptopterus
Think of this as the bigger, moodier cousin of the glass catfish. It hangs in the midwater in a loose group, ghosting along in the shade and coming alive at feeding time. Super chill with similar-sized fish, but it will snack on tiny tankmates if they fit in that wide mouth.
Boeseman's rainbowfish
Melanotaenia boesemani
Boesemani rainbows are basically little swimming fireworks once they settle in-males get that wild split-color look (blue up front, orange in back) and they'll flash and posture at each other all day. They're super active and way happier in a real group with a long tank to cruise, not a cramped setup where they can't stretch out.
Borari knodus tetra
Knodus borari
Knodus borari is a tiny, brand-new-to-science (described in 2023) little characin from Brazil's lower Rio Tapajos area. Its wild habitat is a moderately fast stream over rock-gravel-sand, so I'd treat it like an active small schooling tetra that appreciates clean, oxygen-rich water and some current.
Borneo sucker
Gastromyzon fasciatus
Gastromyzon fasciatus is one of those super-cool little Borneo hillstream loaches that scoots around rocks like a tiny stingray and parks itself in the current. It really shines in a river-style setup with lots of smooth stones to graze on and high oxygen - they look busy all day and have a neat, banded pattern.
Borneo sucker (Segama River gastromyzon)
Gastromyzon spectabilis
This is one of the true Borneo "suckers" from fast, rocky streams - the kind that park themselves on stones and graze biofilm like a little living coaster. FishBase notes its distinctive live coloration/patterning (the whole reason it got named spectabilis), and it stays small, so its whole vibe is more "stream tank grazer" than "loach that cruises around." If you give it clean, oxygen-rich water and lots of algae-covered rock, it will reward you with nonstop weird, cool hillstream behavior.
Boulenger's featherfin tetra
Bryconaethiops boulengeri
This is a big, super-active African tetra from the Congo basin that really wants open swimming room and a group of its own kind. It cruises the mid-to-upper water and will absolutely chase down insects at the surface, so a tight lid is smart if you keep it.
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Brilliant rummy-nose tetra
Petitella bleheri (syn. Hemigrammus bleheri)
This is the rummy-nose with the really "full-face" red that runs back past the gill plate, plus that crisp black-and-white tail that flashes when the whole group turns together. When they're happy and the water's clean, they school tight and look like one living fish-when they're stressed, that red head fades fast, so they're basically your tank's mood ring.
Bristlenose Pleco (Common Bristlenose)
Ancistrus cirrhosus
The Bristlenose Pleco is a small catfish with a sucker mouth, armored body, and distinctive bristles on its face, especially in males. It is primarily nocturnal and spends much of its time grazing on biofilm and algae from surfaces, making it a popular, hardy "algae-eater" in community aquariums.
Bronze Corydoras
Corydoras aeneus
The Bronze Corydoras is a charming and highly popular freshwater fish known for its peaceful nature and striking bronze coloration. It has a stout body with barbels around its mouth, allowing it to forage effectively on the substrate. Often seen in schools, this species is well-loved for its social behavior and bottom-dwelling habits.
Brown Fork-Tail Loach
Vaillantella cinnamomea
Vaillantella cinnamomea is a slim little Borneo loach with that cool forked tail and a subtle cinnamon-brown body with a dark eye stripe. It spends most of its time hugging the bottom and weaving through leaf litter and roots, then suddenly darts like a tiny torpedo when food hits the sand. Keep the tank covered tight - these forktails are famous for surprise launches.