Three to five years, decided largely by temperature
A white cloud mountain minnow typically lives three to five years in an aquarium. The single biggest influence on where a fish lands in that range is temperature. White clouds come from cool, flowing streams in the mountains of southern China, and their bodies are built for water well below tropical levels. Kept at cool room temperature in an unheated tank, they stay bright, active, and resistant to disease, and four or five years is a normal expectation. Kept for years in a heated community tank at the top of their tolerance, their metabolism runs fast, they age early, and two or three years is more common. Same fish, same food, very different clocks.
Building the cool, flowing tank they evolved for
An unheated aquarium in a normal living space usually sits right in the white cloud comfort zone, which makes this one of the few fish that is easier without extra equipment. What they do need is oxygen and gentle movement: a filter that ripples the surface, or an airstone, copies the stream conditions they expect. Keep them in a school of six or more, because these are social fish that display to each other constantly, the males spreading their red-edged fins in little sparring dances that only happen in a group. Plants, smooth stones, and a darker gravel show off the neon stripe and red tail that give the fish its jewel-like look, and a secure lid matters because a startled white cloud can jump surprisingly well for such a small fish.
Feeding and tankmates for a steady life
White clouds are unfussy micropredators. A crushed quality flake or micro-pellet suits their small mouths, and they relish tiny frozen or live foods such as daphnia and baby brine shrimp, which also bring out their best colour. Feed small amounts they finish quickly, since leftover food in a cool tank decays slowly and quietly. Choose tankmates that share their cool, peaceful world: other white clouds, small danios that tolerate cool water, and bottom fish suited to lower temperatures. Avoid large or predatory fish, because a white cloud is small enough to be a meal, and avoid warm-water species that force the heater question in the wrong direction. In summer heatwaves, watch the tank temperature; a fan across the surface or a cooler room placement protects a school that suffers quietly when the water warms for weeks.
Normal ageing in a minnow school
A mature white cloud at two or three years old is at its visual peak, full-bodied with a bright stripe and rich red in the tail and fins. Truly old fish slim down, their colours mute, and they hover more and dance less, though they should still feed eagerly. If young fish are dying, flashing against objects, or gasping at the surface, heat and oxygen are the first suspects, followed by water quality; test before assuming disease. Because these minnows breed readily in a planted tank, a school may quietly renew itself with youngsters, which is delightful but worth planning for so the tank does not overcrowd itself into poor water.
Small fish, several years of records
Even a three-inch-tank minnow accumulates a history worth keeping: where the school came from, how the tank runs, what has worked. KinsLe Pet Passport holds that record together in one portable packet for each pet, so the white clouds' details are ready for a house move, a new keeper, or any handoff without relying on memory.