Assume the checker will not see them at first
Celestial pearl danios are small, shy, and patterned like a trout stream's gravel, and a checker peering into a planted tank may conclude the fish have vanished. Arrange the handover with that in mind: before you travel, feed the school once with the checker watching, so they see where the fish emerge from, how long they take to gather courage, and what a normal feeding actually looks like. Without that demonstration, a worried checker will overfeed a tank they believe is empty, and the water will pay for their concern.
Tell them plainly that an invisible school at first glance is normal, that tapping, netting plants aside, or switching on extra light to find the fish are the three forbidden responses, and that the correct response is to feed as briefed and wait. Patience is the skill this species hires.
Food must fall where the shelter is
These danios are micropredators that pick small items from the water column near cover. Food dumped in the open centre of the tank is eaten by bolder tankmates or lost to the filter while the school is still deciding whether the coast is clear. Brief the checker to release tiny amounts slowly over and just up-current of the planted areas, in two or three small offerings across a few minutes, so drifting food reaches the edges of cover repeatedly.
Portion the food in advance and keep the amounts honestly small. Fine and powdered foods foul water invisibly, and a small planted tank carrying a holiday week of generous dustings can slide in water quality while still looking beautiful, which is precisely why the checker also reports clarity and the school's willingness to emerge, since a school that stops coming out is reporting the water before any test does.
Keep the world dim, steady, and unchanged
Lights stay on their timer, the lid stays closed against startled jumpers, and nothing in the tank gets rearranged, pruned, or cleaned mid-holiday. A celestial pearl danio school maps its plants closely, and a checker's helpful tidy-up redraws the map the shyest fish depend on. If plants reach the surface and shade the tank further during your trip, that is acceptable; the school will use the extra cover rather than suffer from it.
Temperature and filter checks are the same simple confirmations as for any tank: the reading matches the number in the brief, the filter hums and moves water, and any deviation is a message to you that day rather than an adjustment attempted alone.
Judge the holiday by the emergence
Ask the checker for one daily line: whether the school came out to feed, roughly how many showed, and anything different. That emergence record is the most sensitive instrument available for this species; a school that feeds boldly on day one and barely stirs by day five is telling a story about water, temperature, or a failing filter that deserves your phone call before the week ends.
On your return, feed lightly at the plants, watch the whole school gather, test the water, and make a partial change before resuming the normal rhythm. A school that emerges as eagerly as it did before you left has been well kept, whatever the checker feared about invisibility.
Shy fish need their brief followed exactly because improvisation frightens them, and KinsLe delivers it through its Care Pass, giving your checker temporary, clear access to the danios' feeding areas, portions, and patience-first rules while you are away.