Introduce the group, not just the species
Written instructions for corydoras catfish should introduce the actual group — how many, which species, where they rest — because corys are social fish whose behaviour only makes sense together. A healthy group shuffles across the sand in loose company, rests in a companionable pile, and occasionally shoots to the surface for a gulp of air, which is normal intestinal breathing rather than distress when it is occasional. The note should warn the sitter never to expect a precise headcount under driftwood and plants, and to judge the group by its general bustle at feeding time. Naming the other tankmates matters too, since the corys' holiday problem is rarely themselves; it is faster fish eating first.
Getting food past the midwater crowd
Feeding directions for corydoras catfish solve one problem: delivery. Flakes fed at the surface are gone before a crumb sinks, so the instructions should specify sinking pellets or wafers, pre-counted, dropped at the corys' known gathering corner once the faster fish have had their ration and the light is low. If the tank lights run on a timer, name the drop time relative to lights-out. Portions stay modest — a wafer or two for a small group rather than a handful — because uneaten pellets buried in sand decay unseen. The note should also say what not to do: no extra feeding because the corys 'looked at' the sitter; whiskered charm is not a portion guide.
Sand, barbels, and hands-off substrate
Substrate instructions in a corydoras note protect their whiskers. Corys sift sand through sensitive barbels, and damaged or eroded barbels are associated with dirty, sharp, or neglected substrate, so the owner's pre-trip vacuum is what keeps them safe — the sitter's job is simply not to stir things up. Direct the sitter to leave the sand, decor, and resting caves exactly as arranged, and to keep hands, nets, and gravel tools out of the tank. If a cory appears with visibly shortened whiskers, a reddened snout, or sits apart from the group refusing to forage, that observation goes in the daily message, because bottom dwellers hide decline until it is advanced.
Oxygen and water notes for bottom dwellers
Water instructions for corydoras catfish highlight oxygen at the bottom of the tank. Warm, still, or organically loaded water holds less oxygen where corys live, so the owner's preparation — water change, filter check, surface agitation confirmed — carries the holiday, and the sitter only verifies the filter runs and the thermometer holds its usual reading. Frequent surface-darting by the whole group, rather than an individual now and then, is the written red flag for low oxygen or deteriorating water, and the response is a call to the owner, not an improvised water change. Top-ups use conditioned water only, added gently rather than poured from a height onto the sand.
The sitter's short reporting list
Reporting instructions for corydoras catfish stay brief and observable. Good signs: the group forages together at the evening drop, rests in company, and shows clean whiskers and full fins. Report the same day: a cory isolated and motionless across two visits, visible barbel loss, cloudy water, a stopped filter, or any death in the tank, with a photo where possible. Contacts run owner first, then an aquatic vet or experienced fish shop if the owner cannot be reached and several fish are affected. Close the note by making the sitter's real duty explicit — feed the bottom, watch the group, report early. Held in a KinsLe Care Pass, those corydoras instructions give your sitter temporary, clear access whenever they visit, so the sand-level routine runs exactly as you wrote it.