What a new vet needs for a fish this small
A celestial pearl danio is around two centimetres long, intensely shy, and almost impossible to examine meaningfully in a bag or a clinic tank. That makes the written handover the appointment: bring your water parameter log, the tank's size and full stocking list, the feeding routine, the water change schedule, and notes on any illness or treatment the tank has seen. A vet meeting this school for the first time cannot ask the fish anything, so the records have to speak for them.
The water log matters most for this species
Celestial pearl danios come from cool, vegetated ponds and do best in stable, neutral to slightly alkaline water, and the pattern in your readings matters more than any single result. Hand over several recent sets of results — ammonia, nitrite, nitrate, pH and temperature — rather than just today's numbers, because a school that has gone quiet and stopped displaying could be reacting to a drift your log makes visible at a glance. Include the water change routine that produced those readings: how much, how often, and how the replacement water is treated before it goes in.
Stocking, feeding and social notes the vet cannot see in a visit
Write down the school's size and sex balance — males are the vividly spotted, orange-finned fish, females paler and rounder — plus every tank mate sharing the water, since celestial pearl danios are easily outcompeted and a feeding problem often turns out to be a tank mate problem. Record what the school actually eats: these are small-mouthed fish that take fine crushed food and tiny live foods mid-water, and a note that they ignore large flakes saves the vet a wrong turn. Note where the school came from and how long you have kept it, as source and settling history shape every judgment about a delicate fish.
Bring photos and video because the fish will hide
A celestial pearl danio at a clinic will wedge itself into a corner and show none of its normal behaviour, so bring clear photos and a short video of the school at home: males sparring and displaying over the plants, the group feeding, any individual that looks thin, pale or reclusive. Video of the healthy normal school is as valuable as footage of the fish you are worried about, because it gives the vet a baseline for this group's colour and activity that no verbal description matches. Note on the handover when the change you are concerned about first appeared, in terms of what the fish stopped doing.
Add the tank's history, including treatments and losses
List anything the tank has been treated with, any fish lost in recent months and what signs preceded those losses, any new additions or plants that arrived before the problem, and your quarantine practice for newcomers. For a schooling fish, the tank's recent past is frequently the diagnosis trail: a new arrival, a skipped water change pattern, a heater fault. Write it plainly and completely rather than filtering for what seems relevant — relevance is the vet's call, and it can only be made from a full record.
Pulling the water log, stocking list, feeding notes, history and home video together before the appointment is exactly what KinsLe's Pet Passport is for, keeping a celestial pearl danio school's records in one packet the new vet can work from immediately.