Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 556 species
Tiger watchman goby
Valenciennea wardii
This is one of those classic sand-sifting sleeper gobies that will stay busy all day taking mouthfuls of sand, picking out tiny foods, and spitting the clean sand back out. Super chill temperament, but it really wants a mature tank with a real sandbed so it can do its thing without slowly starving. Also heads-up: they can redecorate by burying frags and making little bulldozer trenches.
Tippecanoe darter
Etheostoma tippecanoe
Teeny little riffle goblins that perch on the gravel and then rocket up to grab passing bugs. Males get a cool orange throat and fin edges in breeding season, and they spawn by burying eggs in clean pea-sized gravel. Awesome fish to watch, but they need cool, super-clean, fast-moving water to thrive.
Tom Coon's orestias
Orestias tomcooni
Orestias tomcooni is a little high-altitude killifish from the Lake Titicaca basin, built for chilly, oxygen-rich water. It is one of those super-niche Andean natives you almost never see in the trade, and the big "gotcha" is that it wants cool temps long-term, not a standard tropical setup.
Tombigbee darter
Etheostoma lachneri
This is a tiny Gulf Coastal Plain darter from the Tombigbee drainage, and the males get seriously wild in breeding colors - green/turquoise with orange and blue patterning. In the wild they hang around that stream transition zone from pools into riffles, sticking close to the bottom around sand-gravel, rubble, and snag cover. Think of it as a little bottom-perching insect-hunter that really wants clean, well-oxygenated flowing water.
Tonguetied minnow
Exoglossum laurae
Exoglossum laurae (tonguetied minnow) is a freshwater leuciscid minnow of cool, clean, rocky streams in parts of the eastern United States. It has a distinctive ventral mouth adapted for benthic feeding, and it is associated with pebble/rock nest spawning behavior documented for Exoglossum in scientific literature.
Tubeshoulder
Mentodus mesalirus
Mentodus mesalirus is a deep-sea tubeshoulder - one of those wild ocean fish that can squirt a bioluminescent fluid from a special tube organ near the shoulder. It is not an aquarium species at all, but it is seriously cool from a biology standpoint because that light-producing setup is basically its whole claim to fame.
Tuivai stone loach
Mustura tuivaiensis
Mustura tuivaiensis is a tiny little brook/stone loach from the Tuivai River in Manipur, India - a bottom-hugging stream fish that spends its time nosing around the substrate. It is one of those "real" river loaches that really appreciates clean, oxygen-rich water and lots of cover (rocks, pebbles, leaf litter) so it can scoot from hideout to hideout.
Tumba tetra
Alestopetersius tumbensis
This is one of those lesser-seen Congo Basin African tetras, a small, silvery shoaler that really comes alive when you keep it in a proper group. It is from the Lake Tumba/Malebo Pool area, and like a lot of alestids it is an active midwater swimmer that appreciates space and clean, well-oxygenated water.
Tussy's small red fighter
Betta tussyae
Betta tussyae is a tiny little blackwater betta from peat swamp forests in Pahang, Malaysia, and it stays small enough that you can really do it justice in a compact, heavily planted tank. It likes soft, very acidic water and a calm setup with lots of leaf litter and cover, and it will absolutely use the labyrinth organ to gulp air like other bettas.
Twig catfish
Farlowella knerii
A true twig impersonator from the Ecuador-Peru headwaters, Farlowella knerii spends its days clinging to wood and plant stems while grazing on biofilm. Peaceful and shy, it looks like a stick with fins, and males will even guard neat rows of eggs on glass or driftwood if conditions are right.
Twosaddle Corydoras
Corydoras weitzmani
Weitzman's cory is one of those super sleek Corydoras that looks like it's wearing a little mask-clean lines, subtle patterning, and that classic cory "busy little vacuum" vibe. The best part is watching a whole group cruise the bottom together, then suddenly zip to the surface for a gulp of air like tiny torpedoes.
Uaru (Triangle cichlid)
Uaru amphiacanthoides
Uaru are big, mellow Amazon cichlids with that neat disc-and-triangle body shape and a surprisingly "gentle giant" vibe. They graze and pick at food all day, act super social when kept in a group, and they are famous for serious parent duty when they breed (both parents guard and tend the young).