White Cloud Mountain Minnow Care Guide

The white cloud mountain minnow is the coldwater fish for people who were told they need a heater and don't. A small, hardy, peaceful schooler from cool Chinese mountain streams, it thrives unheated at room temperature, carries a strange near-extinct-in-the-wild backstory, and is the right answer to almost every 'unheated community' question — provided you keep it away from the goldfish it is so often sold to live with.

White Cloud Mountain Minnow at a glance

The sourced figures the welfare engine uses to judge White Cloud Mountain Minnow — the parseable key facts.

Where it comes from

Tanichthys albonubes comes from southern China, its type locality the literal White Cloud Mountain near Guangzhou in the Pearl River Delta, with relict and rediscovered populations in coastal Guangdong, on Hainan Island and into north-eastern Vietnam. Its home is cool, clear, sluggish spring-fed mountain streams, shallow and densely vegetated over sand, pebble and leaf litter. The wild water sits around 14–22 °C, near-neutral and soft-to-moderate. That cool-stream origin is the single most important care fact: this is a subtropical, temperate 'coldwater' fish, not a tropical one. It thrives unheated and is stressed by prolonged warmth — the exact inverse of the usual 'needs a heater' advice. The sluggish, planted habitat also tells you it wants gentle flow, planted cover and open swimming lanes rather than strong current, and its wide chemistry tolerance is a big part of why it is so beginner-friendly.

Did you know?

• It was nicknamed the 'Poor Man's Neon Tetra' in the 1940s–50s, when neons were rare and expensive and this cheap, hardy, similarly-striped fish stood in for them.
• It was believed extinct in the wild — no reports for around twenty years led to it being considered lost from its native White Cloud Mountain by about 1980, the habitat ruined by pollution and tourism, before relict populations were rediscovered on Hainan and near Guangzhou around 2003–2004.
• It is endangered at home yet ubiquitous in the trade — listed as a protected species in the China Red Data Book and effectively extirpated across much of its range, while remaining one of the most mass-farmed aquarium fish on Earth (its formal IUCN status is the cautious Data Deficient).
• It froze the books — surviving water down to about 5 °C and being overwintered outdoors under ice makes it a true unheated and even pond fish in temperate climates.
• It hides a species complex — in 2022 researchers split the Tanichthys albonubes complex and described six new species from southern China, so some 'white clouds' in the wild and trade are genetically distinct.
• The genus Tanichthys honours Tan Kam Fei, a Boy Scout leader credited with first collecting the fish near Guangzhou, and recent taxonomy has elevated it into its own family, Tanichthyidae.

Tank size — and why

A 10-gallon tank is the practical floor for a small school, with a 15–20 gallon or 60 cm-plus footprint better for the group of eight to ten the fish really wants — FishBase's 'minimum 60 cm' note points the same way. The driver is swimming room and group size, plus surface area for oxygen in an unheated tank, not territory or bioload; these are tiny, low-waste, active swimmers. A longer footprint gives tighter schooling and steadier temperature, so favour length over height for what are really restless mid-and-upper-water cruisers.

As a guide, a 20-gallon tank comfortably suits about 8–11 White Cloud Mountain Minnow as a single-species display, leaving room for tankmates.

See it to scale

Adult White Cloud Mountain Minnow reach only about 4 cm (1.6 in) long — close to the size they are sold at, so what you see is roughly what you get. The catch is the group: a proper shoal still needs about a 15-gallon tank, around 51 cm long.

Adult size is sourced; tank length is approximate for a standard 15-gallon aquarium.

Water parameters in practice

Keep it cool — about 18–22 °C is the ideal band, with many keepers citing 18 °C (64 °F) as the sweet spot — and accept a wide pH of 6.0–8.5 and soft-to-moderate hardness, breadth that makes it genuinely forgiving. The defining feature is cold tolerance: it survives down to roughly 5 °C and has been overwintered outdoors under ice, which is why it makes a true unheated or pond fish in temperate climates. The warm ceiling is where the sources disagree and you should hedge: one care source says it cannot be kept long-term in tropical tanks above about 23 °C, while Aquarium Co-Op is more permissive at up to about 25 °C. They all agree on the substance — permanent tropical warmth is harmful and shortens its life — so treat the exact ceiling as contested but keep the fish cool to be safe. The real parameter risk here is chronic overheating, not water chemistry.

Diet & feeding

A micropredator and omnivore that in the wild takes zooplankton, small insects, worms, crustaceans and detritus. In the tank it readily takes quality flake and small or nano pellets as the staple, supplemented with daphnia, cyclops, baby brine shrimp, microworm and frozen bloodworm to bring up colour — especially the red in the fins — and breeding condition. Feed small amounts one to three times a day; the mouths are tiny, so feed sparingly to protect water quality. They are eager mid-and-upper-water feeders that dart for food and are easy to feed, not fussy.

Gear & setup

The headline piece of 'gear' is the one you don't buy: no heater. This is a coldwater fish that does best at room temperature and dislikes prolonged tropical heat. A gentle-to-moderate filter suits its sluggish-stream origin. Dark substrate intensifies its colour, and dense planting with open swimming lanes mimics the vegetated stream while giving the school room to cruise. It is an active surface swimmer that can jump, so a lid or cover is sensible.

Temperament & behaviour

Peaceful and sociable — a very easy resident of a well-kept cool community, with no territoriality and no fin-nipping of tankmates. The one behaviour that can look like aggression is harmless: males are more colourful and 'spar', flaring their fins and performing a ritual dance to display and attract females, and they may nip lightly at each other, but it does not escalate into real fighting. It is courtship display, not conflict. The one pairing to actively avoid, despite the engine clearing it on shared coldwater tolerance, is goldfish: common and fancy goldfish grow far larger (15–30 cm versus the minnow's 4 cm), produce heavy waste, and will outcompete, injure and eventually eat the tiny minnows. The coldwater logic that keeps recommending this pairing is right; the size logic is wrong.

Group & social needs

A schooling fish that must be kept in a group. Five or six is the floor, but it shows its active schooling, bolder behaviour and the males' courtship colour only in a proper group, so target eight to ten or more. Under-stocked fish are drabber, more skittish and prone to hiding; treat six as the bare minimum and aim higher.

Compatible tank mates (preview)

A short, engine-cleared shortlist — the species TankStocking's welfare engine clears with White Cloud Mountain Minnow and that suit its size and temperament best. Tap any to load the pairing in the planner.

• Amano Shrimp — Peaceful temperament, similar adult size.
• Assassin Snail — Peaceful temperament, similar adult size.
• Cherry Shrimp — Peaceful temperament, similar adult size.

A note on the shrimp and snails here: White Cloud Mountain Minnow is peaceful and generally invertebrate-safe — but almost any fish will take very small shrimplets given the chance, so give shrimp dense cover (moss, leaf litter) if you want a colony to grow, rather than expecting every baby to survive.

This engine-cleared shortlist is White Cloud Mountain Minnow's tankmate surface for now — a dedicated tank-mates guide can follow for high-demand species.

Breeding & sexing

One of the easiest egg-scatterers for beginners — often called very easy to breed, and it will frequently spawn unprompted in a planted community. Sexing is straightforward enough once mature: females are rounder-bellied and a little larger, males slimmer with brighter red fins and more intense stripe colour, especially when displaying. It is a continuous spawner that breeds through spring to autumn at the cool end, around 18–22 °C, scattering eggs among fine-leaved plants, moss or a spawning mop with no parental care. Unusually for an egg-scatterer it is relatively non-cannibalistic toward its own eggs and fry, so a few fry often survive even in a community planted tank. Eggs hatch in roughly 48 to 60 hours; start fry on infusoria-grade food, then microworm and baby brine shrimp, and keep them cool and clean.

Lifespan

Typically three to five years, with five to seven achievable on cool, clean care and Wikipedia citing five years or longer. The dominant factor by far is temperature: keeping this coldwater fish at tropical temperatures accelerates its metabolism and significantly shortens its life, while cool water promotes longevity and disease resistance. Poor water quality, too small a group and weak inbred stock from some colour strains also take their toll.

Common mistakes

• Treating it as a tropical fish and keeping it too warm. This is the number-one error — it is a coldwater/subtropical species, and chronic warmth above the mid-20s shortens its life. Do not house it permanently with warm-water tropicals.
• The goldfish trap. Pairing it with common or fancy goldfish because 'both are coldwater' is a welfare mistake: the goldfish outgrow, outcompete and eventually eat the minnows. Keep white clouds as their own coldwater community instead.
• Keeping too small a group. One to five fish are drab, skittish and hiding, with none of the display behaviour; buy eight to ten or more.
• Adding larger or predatory tankmates. At about 4 cm it is prey for many fish, so avoid big-mouthed or boisterous species.
• Assuming 'hardy' means 'needs nothing'. It is genuinely hardy, but it still needs a cycled, clean, cool tank and a real school.

Signs of trouble

• Colour fading to pale or grey — the first and clearest stress signal in this fish.
• Clamped fins, hiding and loss of schooling — general stress, often traced to heat or poor water.
• Reduced appetite and lethargy — worth investigating early, as cool water normally keeps these fish lively.
• Flicking or scratching and white spots — ich, the usual stress or new-tank disease; cooler water at least slows many pathogens.

Is this fish right for you?

Don't buy white cloud mountain minnows if your tank runs warm — a tropical community at 26 °C or more with no way to keep it cool is the wrong home for a coldwater fish. Skip them if you want a single 'pet' fish, since they need a group, or if your only coldwater plan is to keep them with goldfish, which ends badly for the minnows. On stock quality, the long-finned 'Meteor' strain and some inbred pastel variants can be weaker than wild-type, so buy active, well-coloured fish; reassuringly, the trade is almost entirely farm-bred, so buying captive-bred stock carries no wild-collection burden despite the species being imperilled at home.

Bringing one home

Float the bag to match temperature, then add tank water gradually over fifteen to twenty minutes before netting the fish into a cycled tank and leaving the transport water behind. It is among the hardiest nano fish, so acclimation is undemanding, but mind the temperature direction — settle it into cool water, not a warm tropical tank — and quarantine new arrivals to protect the school.

Common questions

Do white cloud mountain minnows need a heater?

No. This is a coldwater, subtropical fish that does best unheated at room temperature, around 18–22 °C, and it even survives down to roughly 5 °C. The real risk is keeping it too warm, so a heater is usually unnecessary and prolonged tropical heat is harmful.

Can white cloud minnows live with goldfish?

It is best avoided despite the shared coldwater tolerance. Common and fancy goldfish grow far larger (15–30 cm versus 4 cm), make heavy waste, and will outcompete, injure and eventually eat the tiny minnows. Keep white clouds as their own coldwater community instead — a small juvenile goldfish is at most a temporary arrangement.

How many white cloud minnows should I keep?

Six is the bare minimum; eight to ten or more is the real target. They are schooling fish — small groups are drab and skittish, while a larger group is confident, active and shows the males' courtship colour.

What are good tankmates for white cloud minnows?

Other small, peaceful, cool-tolerant fish: zebra and celestial pearl danios, pygmy or peppered corydoras, small rasboras, peaceful killifish and dwarf shrimp all work. Avoid goldfish, any larger or predatory fish, and warm-water tropicals such as discus.

Are white cloud minnows really endangered?

In the wild, effectively yes — they were once thought extinct in their native habitat and survive only in scattered, fragmented sites, and China protects them in its Red Data Book (the formal IUCN status is the cautious Data Deficient). Yet the fish you buy is almost always farm-bred, so keeping them carries no wild-collection burden.

What temperature do white cloud minnows need?

Aim for about 18–22 °C, with 18 °C often cited as ideal. They tolerate down to roughly 5 °C. Sources disagree on the warm ceiling — somewhere around 23–25 °C — but all agree that permanent tropical warmth shortens their lives, so keep them cool.

Sources & confidence

Sources & confidence (8 species)

These back the White Cloud Mountain Minnow figures and the previewed tank mates above. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

• White Cloud Mountain Minnow Tanichthys albonubes — Seriously Fish (seriouslyfish.com/species/tanichthys-albonubes) high confidence
• Amano Shrimp Caridina multidentata — Aquarium Co-Op amano shrimp care; Aquadiction high confidence
• Assassin Snail Clea helena (Anentome helena) — The Shrimp Farm (theshrimpfarm.com/posts/assassin-snail-care) high confidence
• Cherry Shrimp Neocaridina davidi — Aquarium Co-Op cherry shrimp care; The Shrimp Farm high confidence
• Ghost Shrimp (Glass/Grass Shrimp) Palaemonetes paludosus — The Shrimp Farm (theshrimpfarm.com/posts/shrimp-caresheet-ghost-shrimp-palaemonetes-sp) medium confidence
• Gold White Cloud Mountain Minnow Tanichthys albonubes (gold form) — Aquarium Co-Op white cloud care guide; Seriously Fish (Tanichthys albonubes) high confidence
• Mystery Snail Pomacea bridgesii — Aquarium Breeder; Aquatic Arts mystery snail guides high confidence
• Bamboo Shrimp (Wood/Fan Shrimp) Atyopsis moluccensis — Aquariadise (aquariadise.com/caresheet-bamboo-shrimp-atyopsis-moluccensis) high confidence

Care-guide sources (8)

This guide synthesises the references below; where they disagree, the range and the disagreement are noted in the text above. The figures in the key-facts box are read from the TankStocking species database (v2026.06). Full welfare model on the methodology page.

• FishBase — Tanichthys albonubes — authority (Lin 1932), family Tanichthyidae, max 4.0 cm TL, temp 18-22 C plus 'survive as low as 5 C', pH 6.0-8.0, dH 5-19, range (China & Viet Nam, 'thought extinct in the wild'), IUCN Data Deficient (2010), diet, group 5+/min 60 cm
• Seriously Fish — Tanichthys albonubes — synonym Aphyocypris pooni, cool-stream biotope, wild temp 14-22 C, pH 6.0-8.5, hardness 90-357 ppm, size 30-40 mm, 60x30 cm tank, group 10+, sexing, continuous egg-scatterer (hatch ~48-60 h), strains, conservation/extirpation
• Wikipedia — White Cloud Mountain minnow — etymology (Tan/Lin 1932), family Tanichthyidae, ~4 cm, wild temp 18-22 C plus 'survive down to 5 C', lifespan 'five years or longer', 'Poor Man's Neon Tetra' nickname, colour forms, extinction-in-wild + Hainan rediscovery, IUCN Data Deficient
• Aquarium Co-Op — White Cloud Mountain Minnow — temp 18-25 C, no heater needed, overwintered under ice (WA), pH 6.5-8.5, ~4 cm, 10-gal min, group 'at least six', peaceful, male sparring/display, 'very easy to breed', tankmates (shrimp, danios, killifish)
• AquariumStoreDepot — White Cloud Minnow Care Guide — ideal 64 F, 'cannot be kept in tropical tanks above 74 F (23 C)', unheated, pH 6.0-8.5, lifespan 5-7 yrs, 10-gal min, group 6 (8-10+ best), no fin-nipping, goldfish will prey on minnows, hardiest nano fish, male ritual display
• Fishlore / Complete Koi — goldfish-tankmate consensus — large fish and goldfish will eat or outcompete the minnows; size-mismatch welfare risk despite shared coldwater tolerance
• Jin et al. 2022, Journal of Fish Biology 100(4):1062-1087 — 'Descriptions of six new species in Tanichthys albonubes complex (Tanichthyidae) in southern China'; family Tanichthyidae; species complex
• Conservation literature — Threatened fishes of the world: Tanichthys albonubes — believed extinct in native habitat, rediscovery (Guangdong ~2004, Hainan), IUCN Data Deficient, China Red Data Book endangered, threats (pollution/tourism)

More on White Cloud Mountain Minnow

Related guides on TankStocking — each scored by the same welfare engine as the planner.

This care guide is a sourced planning reference, not veterinary advice — individual fish, filtration and maintenance all matter. Cycle the tank, test your water, and observe your fish. How TankStocking works →