Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 665 species
Himachal stone loach
Schistura himachalensis
This is a tiny Himalayan hillstream Schistura that stays close to the bottom and spends its day nosing around between gravel and stones. In a tank they do best when you set it up like a little fast creek - lots of oxygen, clean water, and a bunch of rock piles so they can claim personal space.
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.
Hung's silvermouth cardinalfish
Jaydia hungi
Jaydia hungi is a little marine cardinalfish from the western Indian Ocean (including the Red Sea) that spends its time down near the bottom and comes alive more at night. Like a lot of cardinalfish, the cool party trick is the male mouthbroods the eggs, so breeding behavior is way more interesting than you would guess from a small, silvery fish.
Hyaline cardinalfish
Foa hyalina
This is a tiny little reef cardinalfish that looks almost glass-clear with a few reddish-brown stripes, so it kind of vanishes when it hangs in soft corals. In the wild it tends to be solitary and it tucks itself into Sinularia-type soft coral for cover, then comes alive more at night like a lot of cardinals do. Like other apogonids, it is a mouthbrooder, so once you see a male holding, he will go off food for a bit.
Hypostomus scaphyceps (suckermouth armored catfish)
Hypostomus albopunctatus
This one is a wild Brazilian Hypostomus from the Paranapanema River basin - basically a true armored suckermouth catfish, not something you usually see labeled clearly in shops. One big gotcha: the often-quoted max size of 3.5 cm is very likely based on a juvenile record, so I would not plan a tiny tank around it.
Hypsolebias trifasciatus
Hypsolebias trifasciatus
Tiny but flashy, this annual killi lights up with a blue body and bold yellow-and-black striping on the anal fin. It comes from shallow seasonal pools in northeastern Brazil, so it likes soft, warm water and will bury eggs in a peat or mud-like substrate. Males have big attitudes for such small fish, so plan for line-of-sight breaks or keep a single pair.
Ilyin goby
Knipowitschia iljini
A tiny, bottom-dwelling goby endemic to the Caspian Sea, recorded from the deeper mid/southern basins. It inhabits stable brackish water around 12–13 ppt and does not occur in fresh water. Because it is a deep, cool-water species, it is essentially absent from the aquarium trade.
Imparfinis catfish
Imparfinis piperatus
Imparfinis piperatus is a tiny Brazilian heptapterid catfish that spends its time down on the bottom, scooting around like a little stream goblin. It stays really small (around 3.2 cm SL max), and the neat part is the subtle mottled/striped look and those long barbels that make it look way more "catfish" than its size suggests. Not super common in the aquarium trade, but it is a cool pick if you are into South American stream setups.