A corydoras catfish week is judged at the tank floor
A corydoras catfish routine centers on the bottom it lives on: a partial water change, a hovering siphon pass that skims waste off the sand's surface without churning it, a deliberate look at every fish's barbels, a full count of the group, and a check that sinking food is genuinely reaching the floor. Finish by testing the water and confirming the filter flow has not strengthened into a current these bottom-dwellers must fight. A corydoras reads its world through its whiskers and belly, so the weekly measure of your care is the condition of the lowest inch of the tank.
Why the siphon hovers for a corydoras catfish
A corydoras catfish finds food by tasting the substrate with the sensitive barbels around its mouth, and those barbels wear down when the floor harbors rotting waste and sharp, fouled gravel. Digging a vacuum deep into the substrate stirs buried debris into the water column and can bury or scatter the fine surface layer the fish sifts. Hovering the siphon just above the sand lifts settled waste while leaving the floor's structure — and the corydoras's foraging ground — intact. On sand, a gentle swirling motion a breath above the surface raises debris into the tube without taking the sand with it, which is the technique this species' routine is built around.
Running the corydoras catfish session in order
Count the group first while they are settled, since a corydoras group startled by tools will scatter into cover and become uncountable. Do the hovering floor pass zone by zone, then the water change with matched water returned gently at one end so the bottom is not blasted. Rinse filter media in removed tank water and check that any intake near the floor is guarded, because a resting corydoras against an unguarded intake is a real risk in a quiet tank. Drop the week's sinking food in after the session settles, in more than one spot, so subordinate fish eat without crossing the whole floor.
The barbel check that anchors corydoras care
A healthy corydoras catfish carries three pairs of neat, full-length barbels, and routine day is when you verify them fish by fish as they forage. Shortened, reddened, or missing barbels mean the substrate has been working against the fish — respond with more frequent surface passes and a hard look at whether the floor covering itself is too coarse. While you watch, note bellies that read hollow behind the pectoral fins and any fish that sits apart from the group, since a corydoras is a social animal and solitude is a symptom. Breathing should stay even; this species also darts to the surface for a gulp of air now and then, which is normal in moderation.
When a corydoras catfish needs faster help
Frequent frantic surface trips by a corydoras catfish, far beyond the occasional gulp, point to low oxygen or poor water and deserve an immediate test and change. A fish with eroding barbels plus redness at the belly should be discussed with an aquatic veterinarian promptly, as floor infections move quickly once the whiskers are gone. If the whole group stops foraging and huddles silent, treat it as a water emergency first and a disease question second. In KinsLe, Care Teams keeps a corydoras catfish's weekly change, hovering floor pass, and fish-by-fish barbel check as assigned, timestamped tasks, so the bottom of the tank never depends on one person's memory.