The short answer for peppered corydoras
A peppered corydoras kept well in a home aquarium commonly lives about five to ten years, and individuals in especially stable tanks sometimes go beyond that. That is a longer commitment than many buyers expect from a small, inexpensive bottom dweller, so the purchase decision deserves the same thought you would give a fish twice its size. A peppered cory bought on impulse for a brand-new, uncycled tank may only manage a fraction of that span, while one added to mature water with companions of its own kind settles in and quietly gets on with life for years.
Why the range is so wide
Peppered corys are hardy fish, but hardiness is not the same as indifference. Much of their lifespan is decided by what happens at floor level, where waste settles and oxygen runs thinnest. These catfish root through the substrate constantly, sifting for food with sensitive barbels around the mouth, so a dirty or sharp bed works against them every single day. They are also a shoaling species at heart. A lone peppered cory in a big, bare tank tends to hide, eat timidly and stress easily, while a group of six or more spreads out, forages confidently and behaves like the busy little cleanup crew people imagine when they buy them.
Setting up a peppered cory for a long life
Start with the floor. Smooth sand or fine rounded gravel lets them dig without fraying their barbels, and a gentle vacuum of the surface during water changes keeps trapped debris from rotting under them. Keep the water clean and steady rather than chasing perfect numbers: regular partial changes, a filter that turns the tank over without blasting a current across the bottom, and no sudden swings in temperature matter more than any single reading. Feed them deliberately instead of assuming leftovers are enough. Sinking wafers, small pellets and occasional frozen foods delivered after the mid-water fish have eaten ensure the corys actually get a share, because a hungry cory at the bottom of a community tank slowly loses condition while the tetras above look fat.
Tankmates and temperature choices that matter
Peppered corys are among the more cool-tolerant corydoras, comfortable in water a little cooler than many tropical community fish prefer, so avoid baking them in a very warm tank set up for heat-loving species. Choose peaceful companions that will not nip at them or outcompete them at feeding time, and skip boisterous bottom rivals that claim the same floor space. Give the group some cover — a cave, a plant thicket, a piece of wood — arranged along the back and sides, while leaving open sand at the front where you can watch them work and check that every fish is feeding.
Signs a peppered cory is struggling
A healthy peppered cory is active at dusk, plump behind the head and quick to investigate food. Worry about the fish that sits apart from the group, stops sifting, or shows shortened, worn barbels, since barbel erosion points to substrate or water-quality trouble at floor level. Rapid trips to the surface are normal for this species in moderation — corys gulp air — but frantic, repeated dashing from the whole group suggests oxygen or ammonia problems that need a water test and a partial change the same day. If one fish keeps declining after the water is corrected, separate advice from an aquatic veterinarian or an experienced local fish shop is worth seeking rather than adding treatments at random. Recording each group's arrival details, preferred foods and water-change rhythm in KinsLe's Pet Passport means that long cory lifespan is supported by a care history that stays complete and portable, not by memory alone.