Move the whole cory shoal together, low and smooth
Corydoras are moved safest as a complete shoal in a rigid, lidded container of their own tank water, resting on a smooth surface rather than gravel. A shoal separated during an emergency move stresses every fish in it, and the last cory being chased around an emptying tank is the one most likely to injure a barbel or get trapped under sliding decor. Herd the group gently toward a wide submerged container with a slow hand or a piece of card, and let them swim in together. Corys have small spines in their fins that can catch in net mesh, so a container is safer than a net for this particular fish.
Handling facts that matter for a corydoras
A corydoras being moved can raise its pectoral spines and release a mild defensive response when it feels trapped, which is a good reason to keep hands out and let the fish stay submerged. Its barbels, the whiskers it tastes the substrate with, are easily abraded on rough gravel or dry surfaces, and damaged barbels make feeding difficult for days afterwards. Because they live on the bottom, waste stirred up while their home tank drains settles into exactly the water layer they occupy, so fill their travel container early, before the emptying begins.
Emptying the home tank in the right order for corys
For corydoras, the order of an emergency emptying protects the fish waiting to move. Fill and lid the travel container first, with water taken from mid-tank while it is still clean. Remove tall decor and rocks before you start guiding fish, so nothing topples onto a cory sheltering underneath, a common injury when tanks are stripped in a hurry. Keep the substrate wet until the shoal is out, because corys will bury their noses and sit tight in damp sand rather than panicking in open air.
The journey for a bottom-dwelling shoal
To carry corydoras, set the container low in the vehicle where it cannot slide, wrap it for darkness, and keep it level so the shallow layer over a bottom fish does not slosh from end to end. Corys travel quietly when they can huddle together on a flat base in the dark, and most will be resting in a group by the time you arrive. Check the lid is secure at every stop rather than opening it.
Settling corys into temporary quarters
Corydoras settling well will regroup on the bottom, barbels sweeping the surface, within an hour of release into dim, quiet housing. Give them a cave or plant cover touching the substrate and a smooth area of sand or bare base where they can feed without abrading their whiskers. Release them by sinking the container and letting the shoal swim out at bottom level, never by tipping them down through open water. Over the following days, watch for a fish sitting apart from the group, barbels looking short or inflamed, or fins clamped against the body. Those signs after a move, or a shoal that will not feed by the second day, deserve prompt advice from an aquatic veterinarian.
Passing the shoal's routine to new hands
Corydoras in borrowed housing are often underfed by hosts who scatter food at the surface for other fish, never realising this shoal feeds on the bottom after lights dim. A clear note covering their sinking food, their evening feeding, and their need to stay as a group prevents that quiet mistake. Handing over is easier when KinsLe Pet Passport keeps the corydoras records and routine together for whoever receives them.