Log the Event While It Is Still Happening
Power cuts are remembered as worse or shorter than they were, so the record has to be made during the event, on your phone if the house is dark. Note when the power went and when it returned, and — more valuable than either — the lowest temperature each tank reached and how fast it fell, read from the thermometer as it happens rather than reconstructed after. Record which tanks were affected and which were not, because a large tank in a warm room and a small tank by a window live through the same cut as entirely different events. If you only capture three numbers, make them duration, lowest reading and the tank it came from.
Note What You Did, in the Order You Did It
Write down your interventions as a simple sequence: lids closed and tanks wrapped in blankets or towels, battery air pump started, sealed bottles of warm water floated, feeding stopped. Beside each, note the effect you observed — the temperature holding, the fish settling — because next time the log is your playbook and you will want to know which action actually bought you time. Record what you chose not to do as well: a big water change during a cut feels decisive and usually is not, and noting that you resisted it turns a judgement call into a standing rule for the next outage.
Record the Delayed Effects Over the Following Days
The cut ends; the consequences often do not. Stress shows up late — a fish off its food two days later, white spots appearing the following week, a bacterial problem surfacing in the fish that chilled worst. Keep the event's entry open for a while and add these developments to it as they appear, linked plainly: 'first spots noticed three days after the long cut'. Without that link, later illness gets filed as a new mystery, and the pattern — this tank, this species, whenever the temperature swings — stays invisible. Note recoveries too: the tank that shrugged off a long cut has told you something worth knowing about its stocking and insulation. If problems do develop, the entry is also what you hand to an aquatic vet: a dated sequence of what the fish went through beats a worried summary from memory.
What a Swing History Tells You About Your Setup
Read across several entries and the log becomes an audit of your equipment and habits. The tank that loses heat fastest may need its lid sealed, its position moved from the draughty wall, or a second heater sized for outages; the room whose temperature swings daily explains the appetite pattern you kept blaming on the food. Swing records also settle buying decisions honestly — whether the battery pump or backup heater you have been considering is a luxury or, for your smallest tank, plainly overdue. Keep the history with each tank's main log, not in a separate incidents file you will forget exists. Held together like that, an outage history earns its place in KinsLe's Pet Passport, where each tank's temperature swings, power cuts and recoveries stay in one packet with the rest of its records — ready the day a vet, an insurer or a buyer asks what this tank has been through.