Corydoras records repay an early start because this is a fish whose wellbeing is genuinely collective. A single corydoras tells you little; the group resting together, feeding together, and keeping its barbels long and intact tells you almost everything. Begin the log on arrival day with the group's identity and the floor it will live on, then let the record follow food to the bottom, whiskers, and membership changes, and you will own a history that makes every later judgement about the school quicker and kinder.
Arrival entry: species, numbers, and the floor they inherit
Open the corydoras record with the species name as sold, the number you bought, where they came from, and a group photograph that captures individual markings, since many corys differ subtly in pattern and size in ways that later let you track a particular fish. Record the substrate they have landed on in specific terms, sand or fine rounded gravel, and its depth, because corydoras dig their snouts into the floor to feed and the surface they inherit shapes barbel health from the first week. Log the tank's temperature and test results on arrival day, the cave and plant shelter available at ground level, and the other bottom dwellers already resident.
Sinking-food records and the bottom-feeding check
Build the corydoras feeding log around a single question: what actually reached the floor. Record the sinking wafers, pellets, and frozen foods you offer, the number of pieces, the time you feed, and a short observation of whether the corys fed directly or whether faster tankmates intercepted the food first. Note your delivery method, scattering across open substrate or dropping after lights-out, and which approach gets the whole group eating, because this discovery is one of the most valuable entries the log will ever hold. Keep the water diary beside it: test results, water-change volumes, and your gentle surface siphoning routine, since the bottom layer where corys live is where waste settles and where their water quality is truly decided.
Barbels, bellies, and the group resting picture
Schedule a monthly corydoras condition note and give barbels the first line. Describe them as long and intact, slightly worn, or shortened, fish by fish where you can, because barbel erosion is one of the clearest early warnings this genus offers and it creeps rather than announces itself. Add a line on bellies and body shape, rounded or hollow, on activity across the group, and on where the school chooses to rest, since a group that suddenly scatters to separate corners is behaving out of character in a way worth dating. Photograph the group at rest occasionally in the same spot; the comparison across months shows growth, condition, and togetherness more honestly than memory manages.
Additions, quarantine, and group-level thresholds
Log every membership change in the corydoras record as an event with context: new fish and their source, any separate quarantine period and its length as you practised it, how the existing group received them, and any loss with the signs that preceded it. Record group-level warnings in the same place: several fish flicking against the substrate, repeated urgent trips to the surface across the school, redness around mouths, or a collective loss of appetite, each paired with the day's water readings and any recent change to food, substrate, or tankmates. Set down when you would seek aquatic veterinary advice, particularly when barbel damage appears in more than one fish, and keep the advice with the entries around it.
Kept from day one, this record follows the school as a society rather than a stock list. Because the school biography sits in KinsLe's Pet Passport, a successor keeper inherits the whisker checks and feeding lessons along with the fish, not just a tank and a nod.