The white cloud mountain minnow is a small, sparkling cyprinid from the streams around White Cloud Mountain near Guangzhou, and it breaks the hobby's default assumption: it does not want a heater. Adults reach about an inch and a half, and a school of six to eight fits a 10-gallon tank at minimum, with a 20-gallon long giving them the swimming room to show off properly. Kept cool, planted, and in a group, white clouds are among the hardiest and most underrated fish in the hobby. They have been kept and bred for generations on exactly that simple care.
A coldwater fish in a heated hobby
White clouds come from cool mountain streams and are built for water in the 60s to low 70s Fahrenheit. Room temperature in most homes is their comfort zone, no heater required - and a standard tropical setup at the upper 70s quietly works against them, speeding their metabolism and shortening their lives. An unheated tank also removes the commonest equipment failure in the hobby - the stuck heater - from the list of things that can go wrong overnight. This makes them one of the very few schooling fish that genuinely belong in an unheated tank, and it defines their tank mates absolutely: anything that needs tropical warmth is disqualified, however peaceful it looks. In return, they shrug off the cool snaps and seasonal swings that would stress tropical species.
School, layout, and the golden form
Keep at least six, and more in a longer tank; white clouds are social, loosely schooling fish that scatter through plants and open water alike when they feel secure. Males spar and display with red-edged fins spread, which needs both females to impress and space to do it in. Plant the tank generously, leave a gentle current if you can - they come from streams and enjoy mild flow - and fit a lid, because a startled minnow jumps well. The golden variety bred from this species is equally hardy and shows up beautifully against dark planting; the care is identical, and mixing the two forms in one school works.
Tank mates in the cool lane
Build a white cloud community from other cool-water fish: leopard and zebra danios, rosy and gold barbs in a bigger tank, and other subtropical species that share the temperature range. Avoid the classic error of adding a goldfish as a fellow coldwater fish - goldfish outgrow the tank, out-eat the minnows, and foul water faster than a minnow setup can handle. Shrimp colonies do well alongside white clouds once the shrimp are grown. Feed small foods daily; white clouds are surface-and-middle feeders with hearty appetites for their size, and a varied diet keeps the red in their fins honest.
Simple care, still worth assigning
A white cloud tank asks little - small daily feedings, a weekly partial water change, a glance at the school - which is exactly why its jobs get forgotten in a busy household. Little and regular beats remembered eventually. KinsLe's Care Teams lets you put this tank's feeding and water changes on named people's lists, each marked done with a timestamp, so the easiest tank in the house still gets its easy care.