Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Water Type
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 303 species
Hemigrammus erythrozonus
The Glowlight Tetra (Hemigrammus erythrozonus) is a small, peaceful South American schooling tetra with a translucent silvery body and a distinctive iridescent orange-red stripe running from the snout to the base of the tail.
Trigonostigma hengeli
This is the little "orange neon line + tiny black wedge" rasbora that absolutely glows when you keep it over a dark substrate with plants and a bit of tannin-stained water. The best part is how tight they school-get a decent group and they move like one fish, super calming to watch.
Hemiodus goeldii
Hemiodus goeldii is one of those sleek, torpedo-shaped South American schooling characins that really looks best when you keep a proper group and give them lots of open swimming room. They can be a bit stressy and skittish if cramped or kept singly, but in a calm, oxygen-rich setup they turn into constant, graceful motion - and theyre often mixed up with similar Hemiodus species in the trade.
Julidochromis ornatus
Julidochromis ornatus is that sleek little Tanganyikan rock-dweller with the gold body and crisp black stripes that just pops against a pile of limestone. Give it a tight maze of caves and it will pick one like its home base, patrol it, and (once paired up) it is a really fun cave spawner to watch. It is small, but it has big "this is my rock" energy - especially around breeding time.
Otocinclus affinis
Otocinclus affinis is a small South American suckermouth catfish prized for grazing soft algae and biofilm on plants, glass, and décor. It has a slender body with a dark lateral stripe and a pale underside, and it is best kept in groups where it feels secure. Although peaceful, it can be delicate when newly imported and does best in mature, well-oxygenated aquariums with plenty of natural growth to graze.
Nannostomus beckfordi
Beckford's pencilfish is that sleek little "stick with fins" that likes to hang in the upper half of the tank at a slight angle and flash a crisp dark stripe. Keep a proper group and you'll see males do these tiny sparring/display moments (no real damage) and the whole school just looks super classy over dark substrate and plants.
Carassius auratus
Goldfish are one of the most popular and recognizable freshwater fish in the aquarium hobby. They are known for their golden-orange coloration, although they can also appear in red, white, yellow, and black. Goldfish are highly adaptable and can thrive in a variety of conditions, making them a favorite among beginners.
Kryptolebias gracilis
Kryptolebias gracilis is a very small Brazilian rivulid killifish from the Saquarema Lagoon basin (Rio de Janeiro State). It occurs in creeks and swamps in open vegetation, often in very shallow water (~5–10 cm), in both clear and tea-coloured water, and feeds mainly on small crustaceans (e.g., ostracods) and terrestrial arthropods.
Xiphophorus hellerii
Swordtails are busy, always-on-the-move livebearers, and the males' "sword" tail extension is the whole show-lots of displaying and posturing in the open water. They're tough as nails in hard, slightly alkaline water, but in tight tanks the males will absolutely bicker and chase each other around.
Moenkhausia guaruba
Moenkhausia guaruba is a newly described Brazilian characin from the upper rio Braco Norte (Tapajos system), and it gets pretty big for a Moenkhausia - think "chunky, fast tetra" vibes. Since its formal description is recent, real aquarium-specific info is still thin, so I'd treat it like a larger, riverine Moenkhausia: keep a proper group, give it current and open swimming room, and expect it to act like a confident midwater schooling fish.
Acanthogobio guentheri
This is a Chinese river gudgeon from the upper Yellow River area, a bottom-hugging little cyprinid that spends a lot of time cruising the substrate. Its vibe is more "stream fish" than "tropical community" - give it good flow, lots of oxygen, and a sand-and-pebble setup and it really shines.
Poecilia reticulata
The Guppy is one of the most popular freshwater fish among aquarium enthusiasts due to its colorful appearance and lively nature. These fish have a wide range of vibrant colors and tail shapes, making them a visual delight in any aquarium. Guppies are known for their peaceful temperament and ease of care, making them ideal for both beginner and experienced fishkeepers.