Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 654 species
Head-and-Tail Light Tetra
Hemigrammus ocellifer
This little tetra does a neat trick in the light-there's a shiny "headlight" spot near the gills and a glowing "taillight" at the base of the tail, so the whole school kind of sparkles as they turn. They're super chill in a group, and they look way better the bigger the shoal is and the more plants you give them to cruise through.
Hexi stone loach
Triplophysa hexiensis
This one is a little taxonomic curveball: Triplophysa rossoperegrinatorum (Prokofiev, 2001) is treated as a synonym of Triplophysa hexiensis in major references, so in the hobby you will basically want to think of it as T. hexiensis. Its a bottom-dwelling river loach from northern China that likes clean, well-oxygenated water and spends a lot of time hugging the substrate and darting between rocks.
Hi-fin headstander barb
Oreichthys cosuatis
Oreichthys cosuatis is a tiny Indian/Bangladeshi barb where the males can throw up a really cool tall dorsal fin and some nice red/yellow accents when they settle in. They spend a lot of time cruising midwater and picking around for food, and they do best when you keep them in a proper little group so they feel bold.
Highbody longnose gudgeon
Microphysogobio alticorpus
Little bottom-hugger from Taiwan’s fast, well-oxygenated streams that spends its day scooting over gravel and picking at biofilm between snacking on tiny insects. Keep a small group over a gritty-sandy bed with good current and they’ll settle in and school nicely, especially if you feed fine live or frozen foods.
Highfin threadsail
Hime diactithrix
This is a deepwater little threadsail/flagfin from the Western Pacific that lives way down on the continental shelf. Its whole vibe is that tall, sail-like dorsal fin with warm orange spotting and bands, but because it comes from around 200-300 m it is basically never an aquarium fish in any normal sense.
Highland swordtail
Xiphophorus malinche
Xiphophorus malinche is a smaller, cooler-water swordtail from fast, clear rivers in Mexico, and the males can show a really neat golden-brown look with blue/purple sheen plus a short yellow sword. It is a livebearer, but it is not the "toss it in a warm community tank" kind of swordtail - it does best kept cool with very clean, oxygen-rich water.
Honey gourami
Trichogaster chuna
Honey gouramis are those little chill labyrinth fish that spend a lot of time cruising the upper half of the tank and "feeling" around with their long thread-like belly fins. Give them plants (especially floaters) and calm tankmates and they really settle in-males can glow that warm honey/orange color and will build bubble nests at the surface.
Horizontal stripe Yunnan loach
Yunnanilus spanisbripes
A small stone loach endemic to the Niulanjiang River in Yunnan, China (upper Yangtze basin). Females show a single dark lateral stripe while males are blotched or spotted. Rare in the trade; if kept, provide clean, well‑oxygenated water, fine sand, and modest current, as with other Yunnanilus loaches.
Hovering Zebra Loach
Yunnanilus cruciatus
This tiny Vietnamese stone loach is a little weirdo in the best way - it often cruises head-down at about a 45-degree angle and will "hover" in the water column while it hunts for snacks. Keep it in a proper group and a planted, mature tank, and you get constant small-fish activity without the drama.
Howes' prodontocharax
Prodontocharax howesi
This is a tiny Amazon-basin cheirodontine characin associated with unusual jaw/tooth morphology in the Prodontocharax/Amblystilbe group. Recent revisionary work revalidated the genus Amblystilbe and treats Amblystilbe howesi as distinct; older secondary sources may list the fish under Prodontocharax howesi, so identification and naming can be inconsistent in non-specialist contexts.
Htamanthi danio
Danio htamanthinus
This is a truly tiny Myanmar danio from little streams around Htamanthi in the Chindwin River basin. It stays under an inch, so it feels more like keeping a bunch of shimmering micro-fish than a typical zebra-danio-style "speedster". Give it plants, calm tankmates, and a group big enough that it feels secure and you will see much nicer, bolder behavior.
Huangwei gu (黄尾鲴)
Xenocypris davidi
Xenocypris davidi is a Chinese river fish that gets way bigger than most folks expect from a "minnow-looking" cyprinid - it's a sleek, open-water swimmer that can hit real dinner-plate size. In the wild it's a benthopelagic species and even shows up in slightly brackish areas, so it's pretty adaptable, but it's not really an everyday home-aquarium fish because of its adult size and need for swimming room.