White Cloud Mountain Minnow

Geographic Origin and Biotope: Originally discovered on White Cloud Mountain in Guangdong province, China. Due to tourism and extreme pollution, the original population was practically destroyed (considered extinct in the wild for years; recently, tiny isolated populations were found in Hainan and Vietnam). Inhabits small, slow, clear, and heavily vegetated mountain streams.

Taxonomy and Morphology: Tiny and delicate Cyprinid (not a tetra). The body is slender and streamlined, maximum 4 centimeters (1.5 inches) long. The mouth is pointed slightly upward, adapted for catching surface insects. Lacks tactile barbels.

Social Behavior: Peaceful to the extreme and totally harmless. It is strictly a schooling fish (keep no fewer than 10 individuals). Males offer continuous, spectacular displays in which they fully spread their fins to establish hierarchy without ever touching or injuring each other. They swim mostly in the mid-upper part of the tank.

Coloration and Sexual Dimorphism: Brown/greenish background with a brilliant white/gold iridescent (neon) stripe running from eye to tail. Males have much more intense colors, flat bellies, and dorsal/anal fins edged in pure white and bright scarlet red. Females are duller, opaque, and with distinctly rounded bellies.

Aquarium Setup: Perfect for nano-aquariums (starting from 60 cm / 24 inches in length) even without a heater. They greatly appreciate a tank densely planted with mosses and Hornwort, but require swimming space and medium-low light. The water should have a gentle flow.

Diet and Feeding: Surface micropredators. In the wild, they eat mosquito larvae, tiny planktonic crustaceans, and fallen insects. In the aquarium, they are unfussy: just use crumbled micro-granular dry food. Feeding small live or frozen daphnia incredibly enhances the males' red livery.

Water Quality: This is the true "cold water fish" for indoor aquariums. The temperature must strictly remain between 14.0 and 22.0 °C (57-72 °F). Constant tropical temperatures (26-28°C) cause severe stress, metabolic acceleration, and premature death within months. Very adaptable regarding pH (6.0 - 8.0) and GH hardness (5.0 - 20.0).

Compatibility and Tankmates: Ideal for an "unheated" setup. Coexists perfectly with Neocaridina shrimp (Red Cherry), snails (Nerite), Peppered Corydoras, or Paradise Fish, provided the latter are not too aggressive. Do not pair with cichlids or large fish that would swallow them whole.

Aquarium Reproduction: Exceptionally simple. They are among the rare Cyprinids that (if well-fed) do not systematically prey on their own eggs and fry. They scatter adhesive eggs in moss daily. In a well-matured tank rich in infusoria, the fry will survive and grow spontaneously alongside their parents.

Risks and Diseases: Indestructible species, highly recommended for beginners. All illnesses and breeding failures stem exclusively from keeping them in heated tropical aquariums at 26°C. Excessive heat lowers immune defenses and causes lethargy and fatal fungal infections.