What to note at feeding time
Feeding is the most reliable daily window into an old fish's health, so make it the anchor of the record. Note the response first: does the fish rise at the usual cue, arrive slowly, or need food delivered to its corner before it notices? Note the amount against its own normal — all of its share, most, half, a few mouthfuls — and what it does with food it takes: eaten cleanly, mouthed and spat, or ignored after the first bite. Refusals of a favourite food carry more signal than refusals of something new. Keep the notation brutally simple: a line, a few words, or a mark out of five for appetite, because the record you keep on a tired evening beats the detailed one you abandon. Two or three entries a week, always at the main feed, will carry the trend.
Reading activity between meals
Appetite tells half the story; movement tells the rest. Once a day, at roughly the same time, note where the fish is and what it is doing: swimming its usual circuit, holding in its resting spot, sitting on the bottom, or spending time at the surface. Old fish rest more as a matter of course; what you are watching for is change in the pattern, such as resting through times it used to patrol, weaker swimming against a current it handled easily, or a new preference for one corner it never used. Note the context that explains a quiet day: warm weather heating the tank, a water change that morning, a new tank mate still being assessed. Without context, a later reader — often you, months on — cannot tell an explained dip from the start of a slide.
Spotting a trend instead of a bad day
Single entries mislead; runs of entries speak. Look back over the record in blocks of a few weeks and ask three questions: is the appetite line drifting down, is resting time lengthening, and are the good days as good as they were? A fish whose appetite dips for two days after a water change and returns is showing noise. A fish whose best days have quietly become its old average days is showing a trend, and that is the point at which the record has done its job, because you have caught slow decline early enough to act on it with gentler feeding arrangements, softer flow, or a vet conversation while the fish is still fundamentally well. Mark any change you make in the record too, so you can see whether it actually helped or merely coincided with a better week.
When a trend becomes a vet conversation
Take the record with you when a trend turns into a consultation: it converts 'he seems off' into evidence a vet can work with — appetite halved across a month, resting doubled, good days gone. Contact the vet promptly when the record shows a sharp change rather than a slope: food refused entirely for several days, a fish that was active last week now sitting on the bottom, or appetite holding while body condition visibly falls. Sudden change in an old fish is rarely just age; slow change usually is. Keeping the feeding record as part of the household's normal routine is what makes it survive long enough to matter: when feeds are logged as tasks through KinsLe's Care Teams, with each completed feed marked and timestamped, the appetite record builds itself from the family's ordinary week rather than depending on one person's memory.