Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 285 species
Black loach
Eonemachilus niger
This is a tiny, deep-velvet-black stone loach from Yunnan, China, with the odd detail that the tail fin is not black like the rest of the fish. Its wild range is extremely limited, so its aquarium presence is basically nil - this is more of a conservation-interest species than something you will actually see for sale.
Black morpho tetra
Poecilocharax weitzmani
Poecilocharax weitzmani is one of those tiny blackwater oddballs that acts more like a little darter than a typical tetra - it hangs low, darts between cover, and the males can get pretty showy with fin-flares. The really cool part is they are cave breeders with male brood care, which is not what most people expect from a small characin. Give them very soft, acidic, super-clean water and lots of leaf litter and hidey holes, and they settle in and start showing their best colors.
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
Black neons are one of those little tetras that look kinda understated until the light hits them-then that bright stripe pops and they shimmer when the school turns together. They're super chill, always cruising mid-water, and they make a tank feel "alive" without being hectic. If you keep a nice group, they get bolder and you'll see way more of their personality.
Black redhorse
Moxostoma duquesnei
Black redhorse are sleek river suckers that really come alive in clean, fast-flowing runs and riffles - they are basically a living indicator that the water quality is good. They cruise the bottom in little groups and pick at insect larvae and tiny crustaceans, and in spring the males can show pink and dark striping when they are in spawning mode.
Black River madtom
Noturus maydeni
Noturus maydeni is a tiny little riffle catfish from the Ozarks that lives tucked into cool, clear, fast water over gravel and rocks. Its claim to fame is being super range-limited (Black and St. Francis river drainages), and like other madtoms its pectoral spines can give you a nasty poke if you grab it wrong.
Black Skirt Tetra (Black Widow Tetra)
Gymnocorymbus ternetzi
Black skirts are those little "suit-and-tie" tetras with the dark bands and flowing fins that look way fancier than they should for how tough they are. They're super active midwater fish, and when you keep a proper group they do that tight, zippy schooling thing that makes the whole tank feel alive. Just give them enough buddies and finny tankmates they won't be tempted to nip.
Black-Lined Loach
Ambastaia nigrolineata
Ambastaia nigrolineata is a little river-loach with two clean black stripes that turns into a really cool barred pattern as it grows. Keep it in a proper gang and you will see all the fun loach stuff - shadowing, clicking, and the occasional goofy "greying out" dominance squabble. It likes clean, well-oxygenated water and lots of nooks to cram into.
Blacktip rasbora
Rasbora dorsinotata
This is a slim little Southeast Asian rasbora with a clean dark lateral stripe and a neat black tip on the dorsal fin. In a group it gets way more confident and you will see that tight midwater schooling behavior, especially in a planted tank with some flow.
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.
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.