White Cloud Mountain Minnow Tanichthys albonubes

Quick Stats

Tank Setup

The White Cloud Mountain Minnow (Tanichthys albonubes) is one of the few aquarium fish that genuinely thrives without a heater. A 10 gallon tank is the realistic minimum for a school of 6–8, but a 20 gallon long gives them room to show their natural tight-schooling behaviour. They come from cool, clear mountain streams in southern China, so water movement and high oxygen matter more than temperature.

Maintain water parameters within: temperature 16–24°C, pH 6.0–8.0, hardness 5–20 dGH. They tolerate an unusually wide range — which is exactly why beginners do well with them. The one thing they will not forgive is sustained heat: above 26°C they become stressed, lose colour, and shorten their lifespan. An unheated tank in a temperate-room house is ideal.

Set up the tank with a dark sandy substrate, driftwood, and hardy plants (Java fern, Anubias, Vallisneria). They prefer a planted background with open swimming space in the front. A gentle hang-on-back or sponge filter provides enough flow; strong canister flow is overkill for this size of fish.

Tank Mates

White Clouds are peaceful, fast, and completely non-aggressive. They work in any community tank where the temperature stays below 24°C — which immediately rules out most tropical species.

Compatible tank mates include: other White Clouds (mandatory — they school), Cherry Shrimp, Amano Shrimp, Nerite Snails, Mystery Snails, and cold-water species like Zebra Danios (at the upper end of their overlap). Avoid housing with goldfish (goldfish will eat them) or any tropical fish that requires 26°C+.

Schooling is non-negotiable. A single White Cloud will pine, lose colour, and hide. Six is the bare minimum; eight to twelve is what you want if you have the space — the school becomes a single moving organism and the males display far more intensely.

Diet & Feeding

White Clouds are unfussy omnivores. In the wild they eat insects, zooplankton, and algae. In the aquarium they accept flakes, micro pellets, frozen daphnia, frozen brine shrimp, and the occasional live baby brine shrimp.

Feed small amounts twice daily. They are surface and mid-water feeders, so floating or slow-sinking foods work best. A varied diet keeps the red and yellow in their fins vivid; flake-only diets fade them over months.

They will also graze on biofilm and soft algae, which makes them a useful cleanup fish in a planted tank — but they will not control an algae bloom the way Otocinclus or Nerite snails do.

Common Health Issues

White Clouds are extremely hardy when kept cool. The single biggest health issue I see is heat stress: people move them into a tropical tank 'for the winter' and they slowly decline. Sustained temperatures above 26°C suppress their immune system and invite bacterial infections.

Like all aquarium fish, they are susceptible to ich (white spot disease) when stressed by temperature swings. The standard heat-and-salt treatment works, but you must keep the treatment temperature below 26°C — pushing it to 28°C to defeat ich will kill the fish you're trying to save.

Prevention is straightforward: stable cool temperature, weekly 25% water changes, and quarantine new fish for two weeks before adding them. They typically live 3–5 years in good conditions.

Breeding

White Clouds are egg-scatterers and among the easiest egg-laying fish to breed. They spawn in the early morning among fine-leaved plants or spawning mops, scattering 20–200 adhesive eggs over several hours.

To raise fry deliberately, move a group of adults to a planted 10 gallon tank with spawning mops or Java moss. Condition them with live or frozen food for a week. After spawning, remove the adults — they will eat eggs and fry given the chance.

Eggs hatch in 36–48 hours. Feed the fry infusoria for the first three days, then graduate to microworms or baby brine shrimp. They grow quickly and are free-swimming within a week. The species is listed as extinct in the wild, so captive breeding genuinely matters.

Frequently Asked Questions