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Found 451 species
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.
Blue gularis
Fundulopanchax sjostedti
This is the big, flashy West African killifish with the ridiculous triple-point tail and electric blue-green body covered in red spotting. Males can be real attitude machines with each other, but if you give them room, cover, and a tight lid, they make an awesome centerpiece fish that will absolutely demolish live and frozen foods.
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.
Bombe (Lake Malawi deepwater clariid catfish)
Bathyclarias nyasensis
This is one of Lake Malawi's big, weird deepwater air-breathing catfish, and it lives out in deeper open water (not the rocky cichlid zones everyone thinks of). What I love about it is the behavior - it actually cruises in groups and filter-feeds zooplankton like a giant catfish vacuum, but it will still snack on small fish and insect larvae when it feels like it.
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.
Boulenger's lamprologine (shell-dwelling Tanganyika cichlid)
Lepidiolamprologus boulengeri
This is one of those really fun Lake Tanganyika shell-and-sand lamprologines that lives as a pair, digs a little pit, and then the female hangs out in snail shells like its a tiny fortress. Give them fine sand and a pile of shells and you will get to watch legit, purposeful cichlid home-building and territory behavior in a small-bodied fish.
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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.