Rewrite the Sitter's Instincts: Cool Is Correct
A white cloud mountain minnow comes from cool, flowing mountain streams, so brief your sitter against every tropical-fish instinct they may bring through the door. There may be no heater in this tank at all, and a thermometer reading that would alarm a guppy keeper is this school's comfort zone. Say it plainly and write it down: do not add a heater, do not warm the water, and do not report a cool tank as a problem. The white clouds should be bright and busy, red showing in the fins, a pale stripe flashing along each flank as the school works the middle and upper water.
Heat Is the White Cloud Emergency
A hot afternoon is the emergency scenario to rehearse, because a white cloud mountain minnow in warming water runs out of oxygen while a tropical tank beside it is still comfortable. Warm water holds less oxygen, and the school will show it by crowding near the filter outflow and the surface, breathing fast, colours dulling, and the usual sparkle gone from their movement. The sitter's approved responses are gentle ones you have demonstrated: close the blind so sun is off the glass, confirm the filter is running and rippling the surface, and switch on any air stone you have provided. What they must never do is improvise cooling with ice, frozen bottles, or a large change of cold tap water unless you direct it live on the phone, because a sudden plunge shocks a fish as surely as the heat does, only faster.
The Thermometer, Read the Right Way Round
Put the thermometer at the centre of this briefing and teach its reading in the direction that matters. A white cloud sitter checks whether the temperature has climbed, not whether it has fallen, so agree the number at which they call you and write it on the sheet rather than leaving them to judge. A sitter who finds the school surface-crowding on arrival should run the heat checks first and phone you with the thermometer reading in hand, because that single number tells you most of the story before the photo even arrives.
Feeding a Small Cool-Water School
Portion the white clouds' food yourself, because a sitter feeding tropical quantities to small cool-water fish will foul a tank that has no heater-driven urgency to excuse it. The school takes tiny food eagerly at the surface and mid-water, and a correct portion vanishes quickly; leftovers drifting down mean the next feed is reported and reduced only on your word, not quietly doubled back later. That permission, given in advance, stops a kind sitter from feeding a struggling school out of schedule and guilt.
Ordinary Signs Still Worth a Message
Heat is the headline, not the whole briefing, so cover the familiar signs in this school's terms. A minnow that separates from the group and rests on the bottom, white spots across several small bodies, frayed red fins, or a fish found dead all earn a photo and a message the same day. Nothing is added to the tank — no treatments, no borrowed heater, no well-meant handful of ice — while you are being reached, and your aquatic contact stands as the backup only if the school is gasping and you are silent.
Leave the Cool-Water Rules Where They Will Be Read
Rehearse the handover standing at the tank on an ordinary day: thermometer first, and the call number is about warmth, not cold. Writing that rule, the surface-crowding signs, and your shade-and-call sequence into KinsLe as a Care Pass protects the school from the most likely accident of your trip, which is not neglect but a helpful person warming a white cloud tank that was never cold.