Yes — bronze corydoras are sociable, busy fish, but they work the lowest layer of the tank where a keeper's attention spends the least time. They shoal together, rest together, and forage through the substrate with sensitive barbels around the mouth. A log compensates for that blind spot: it records whether food truly reached the bottom, whether the group is growing or quietly shrinking, and whether the substrate they sift all day is still kind to them.
Stocking records for a shoaling bottom fish
Log the number in the shoal every time it changes. Corydoras kept in a proper group behave boldly and stay active; a group whittled down by losses can become shy and inactive, and owners often fail to notice the total dropping one fish at a time. Record arrivals, losses, and the size difference between new fish and established adults, because tiny newcomers compete poorly until they grow.
Note substrate changes in the stocking section, not as an afterthought. A switch from smooth sand to coarse gravel matters more to a bronze corydoras than to almost any other fish in the tank, since worn or damaged barbels follow abrasive ground. If you change the substrate, date it — later barbel trouble can then be matched to its likely cause.
Feeding log: did it reach the bottom?
This is the heart of a corydoras log. Upper fish intercept flakes and floating food long before it sinks, so write down what sinking food you offered, where you dropped it, and whether the corydoras gathered on it. Note whether you fed after lights-out for their benefit, and whether wafer or pellet portions were finished by morning or left to foul.
Record body condition when the fish rest at the front glass: bellies gently rounded rather than hollow, barbels full-length rather than stubby or reddened. Note any fish that no longer joins the group's foraging runs across the bottom, because withdrawal from the shoal is often the first visible change in an unwell corydoras.
Patterns the log reveals over time
A month of entries can show that the corydoras only miss out on days when a particular fast tankmate is fed first, or that activity surges after every water change, or that one fish has attended fewer and fewer group feeds. Breeding behaviour, too — bronze corydoras often spawn after cooler water changes, with eggs placed on glass or plants — is worth dating, since eggs and fry change both feeding needs and stocking totals quickly.
Contact an aquatic veterinarian or experienced fish health professional if barbels erode despite soft substrate, if several fish sit listless and separate from the shoal, or if appetite entries decline across a week. A written record of when each sign began makes that conversation far more useful.
Small entries, lasting value
One line nightly — sinking food offered, all fed, group counted — is plenty, with a weekly note on barbels and substrate condition. Consistency beats detail for a fish whose problems develop slowly at the bottom of the tank.
Keep that line-a-night history in KinsLe's Pet Passport, so your bronze corydoras' shoal numbers, bottom-feeding routine, and substrate notes stay in one packet a sitter or vet can read at a glance.