Bottom behaviour tells the carer's first story
A corydoras carer should spend the first minutes of each visit watching the bottom of the tank, because that is where this fish lives its whole life. A settled group snuffles through the substrate in loose company, rests together under cover, and makes occasional quick darts to the surface for a gulp of air. One surface dart now and then is normal corydoras behaviour; repeated frantic trips by the whole group suggest the water needs attention and a message to you.
The carer should also look closely at barbels, the small whiskers around the mouth. Barbels worn short or a fish sitting alone, tilted or refusing to forage, are details worth reporting the same day with a photo if possible. Corydoras are sociable and undemanding, which makes a quiet, withdrawn individual stand out clearly to anyone who has watched the group on a normal day before you left, so show the carer a short video of ordinary behaviour before the trip.
Temperature, flow and clean substrate conditions
Corydoras share their tank's general conditions, so the daily equipment check covers the thermometer against your written range, the filter running steadily, and the water level where you left it. These fish stir the substrate constantly, and a filter that has stopped lets the waste they disturb settle back around them, so a silent filter on a corydoras tank earns a prompt phone call and a follow of your written fault steps.
A glance is enough: substrate looking as usual, no mound of uneaten food building in a corner, no new smell when the lid lifts. If food is accumulating, the answer is a smaller next portion and a note to you, not a deep clean performed by a guest.
Feeding fish that eat last and lowest
Holiday feeding fails corydoras more often than almost any other community fish, because flakes sprinkled on the surface are eaten by faster tankmates long before anything sinks. Leave specific sinking wafers or pellets for the corydoras in labelled daily portions, and ask the carer to drop them in the same open patch of substrate each evening, ideally as lights dim when corydoras become most active.
The carer should wait and watch at least one portion disappear properly during the first visit, confirming the group finds it and eats. If tankmates steal the food, your note can direct the carer to feed the surface fish at one end and drop the corydoras portion at the other. No extra portions for missed days, and no live or frozen treats introduced mid-holiday unless they were already part of the routine you demonstrated.
Tankmates, lid and the evening check
Corydoras tanks benefit from an evening visit rhythm, since the group forages most confidently in lower light. The carer should confirm the lid is fully closed after feeding, because a startled catfish can jump through a surprising gap, and check that no tankmate is harassing the group at feeding time. Fin nipping aimed at resting corydoras during the day is another detail worth a same-day note.
The carer is not being asked to diagnose anything, only to describe what is visible in plain words and pictures so you can decide whether a veterinarian with fish experience or your aquatic shop should advise before you return.
One report a day, sent without fail
Ask the corydoras carer for a daily message covering group activity, food eaten from the bottom, temperature and filter, plus anything unusual seen. Short and factual beats long and reassuring, and a photo of the group on the substrate every few days lets you compare condition across the holiday. If a fish dies, the carer should remove it promptly with a net, note the time, and tell you that day to protect the rest of the group.
Those daily confirmations are easier to keep honest when they are structured rather than remembered. KinsLe Care Teams lets you assign care duties for your corydoras to the person visiting, and each finished task is marked with a timestamp for you to check.