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
Diapoma terofali
This is a little South American characin from the Parana-Uruguay system that stays pretty small but has a neat "glandulocaudine" twist - males have a special caudal gland tied to breeding. In a calm planted setup they act like a typical small tetra-ish fish, cruising midwater and looking best in a group.
Melanotaenia praecox
These little rainbows are like living sparks-electric blue bodies with those punchy red/orange fins, and they look even better the more you keep together. They're constantly cruising the mid-water, flashing at each other and doing that classic rainbowfish "look at me" shimmy, especially when the lights first come on or at feeding time.
Ambastaia sidthimunki
This is the little "Sid" loach people fall in love with once they see a whole group doing their goofy zoomies and clicking at each other. They stay tiny but act like big loaches - always busy, always social, and way more confident when you keep them in a proper gang. Give them sand, hiding spots, and lots of buddies and they really shine.
Trichogaster lalius
Dwarf gouramis are those little jewel-box labyrinth fish that hang out near the surface, cruising through plants and popping up for air when they feel like it. Give them a calm, planted setup and they'll reward you with tons of personality-males especially will posture and show off, and they're classic bubble-nest builders when they're in the mood.
Carinotetraodon travancoricus
This is the famous pea puffer-tiny (around 3.5 cm max) but it acts like a full-size puffer, cruising around and hunting little critters with a ton of attitude. If you give it a heavily planted tank with lots of line-of-sight breaks, you'll get to watch really cool "stalking" behavior all day.
Umbra pygmaea
Eastern mudminnow (Umbra pygmaea) is a small freshwater umbrid native to eastern North America that inhabits slow, vegetated waters such as swamps, ponds, and ditches. It feeds mainly on insect larvae and small aquatic invertebrates and is noted for tolerance of low-oxygen wetland habitats.
Haplochromis pharyngalis
This is one of those Lake Edward haplochromines that has the typical sleek, fast "hap" shape and attitude. It is not something you see in the average fish store, but if you do find it, treat it like a medium-sized African cichlid that appreciates hard, alkaline water and some real swimming room.
Ituglanis eichorniarum
Ituglanis eichorniarum is a tiny, secretive trichomycterid (pencil catfish) from the Paraguay-Parana system, the kind of fish that spends its time nosing through plants and leaf litter instead of cruising the open water. The species name comes from Eichhornia (water hyacinth), which is a fun clue to the sort of weedy habitat it was found in.
Titanolebias elongatus
Titanolebias elongatus is a giant annual killifish from temporary waters in the Lower Parana-La Plata basin - it grows way bigger than most "typical" killies and has that chunky, predatory vibe. It is a bottom spawner with a long egg diapause (months), and its whole lifestyle is built around racing the dry season, which is just wild to watch and work with if you are into breeding projects.
Hyphessobrycon amandae
Ember tetras are tiny little orange "glow fish" tetras that look insanely good over a dark substrate with plants and a bit of leaf litter. They're happiest in a proper little gang, and when they settle in and feel safe the whole school starts moving like one warm, flickery cloud.
Nematobrycon palmeri
Emperor tetras are those classy little Colombian characins with the dark horizontal stripe and the males' awesome trident/lyretail look. Keep a decent-sized group and you'll see the males do their little posturing displays without really hurting each other, especially in a planted tank with some shade.
Poecilia wingei
Endlers are basically tiny little firecrackers-males stay small but flash a ton of neon color and never stop cruising the tank. They're super social and active, and if you keep males and females together you'll have babies before you've even finished tweaking the aquascape.