Why sitters almost always overfeed
The sitter is not careless — the setup invites it. Fish beg expertly, rising and clustering the moment anyone approaches the glass, and a kind person reads that as hunger rather than habit. The food tub gives no sense of scale: a 'pinch' in an unfamiliar hand can be five times the owner's, flakes look like nothing in the container, and instructions like 'feed them daily' say nothing about amount. Where two people in the house both feed, each assuming the other hasn't, the tank gets doubles. Add a sitter's worry that the fish might starve on their watch, and generosity wins every time.
Pre-portioning removes the guesswork
The single fix that works best is to portion the whole trip yourself. Measure each day's food into a labelled pill organiser, small pots or folded paper packets — one compartment per day, exactly the amount you would give, no more available to improvise with. Then hide the main food tub out of sight, because a sitter who runs out of compartments mid-trip should phone you, not freestyle. Show them one feed in person before you leave if you can: thirty seconds of demonstration beats a page of description, and they see that the fish finish it in minutes and still beg.
Instructions that survive real life
Write the essentials on one card kept by the tank: what goes in, when, and what never to add — no extra treats, no feeding by visitors, no second helping because they looked hungry. Name one feeder if several people share the house, and ask them to tick each day off on the card so doubles are impossible. Reassure them plainly that a missed day harms nothing — a skipped feed is far safer than a doubled one if they are ever unsure whether the tank was fed. Leave a note about what normal looks like afterwards — clear water, active fish — and your number for anything else. If the trip is long, a mid-stay photo of the tank tells you more than any report: cloudy water shows up plainly.
A note on automatic feeders
An automatic feeder is the other common answer, and it can work for a short trip — but only one you have run for several days while you are still home to watch it. Feeders vary wildly in what a portion means, flake clumps in humid air above a warm tank, and a unit that jams or dumps on day two is worse than a sitter with pots. If you use one, set it to slightly under-feed, keep the sitter as a checker rather than a feeder, and never let a new feeder make its debut over your holiday.
Coming home to the tank you left
Sitters overfeed out of kindness, and portioned food channels that kindness safely — they can feed generously within the compartment and no further. Set the tank up so the easiest thing to do is the right amount, and you will come home to the water you left. KinsLe's Care Pass hands your sitter temporary access to the tank's exact feeding routine while you are away, so the measured portions and daily tick-offs travel with the job instead of living on a note that gets lost.