Why unsupervised feeding harms fry first
Fry and shrimplets live close to the edge of what their water can support. A visitor's generous pinch of flake — several times what the tank needs — mostly goes uneaten in a breeding or shrimp tank, sinks into the substrate and rots. In a small, gentle-filtered setup that decay drives ammonia up fast, and it is the youngest, smallest animals, with the least reserve, that suffer first. The babies are also the very thing visitors most want to feed, which is why this accident happens in the kindest homes and with the proudest grandparents.
Make the food hard to reach, easy to ration
Move the main food tubs out of the room or into a closed cupboard for the duration of the visit — out of sight genuinely works on helpful people. What stays by the tank is one small pot containing exactly one pre-measured feed, labeled with the words 'today's only feed'. Anyone who does feed uses that pot and nothing else, and an empty pot tells you the feed has already happened. For shrimplets, a single tiny portion of their powdered food in the pot prevents the classic disaster of a spoonful of adult flake clouding the whole tank.
The note on the lid
A short, friendly note fixed to the lid stops more accidents than any conversation, because it is there at the exact moment a hand reaches for the food. Keep it warm and specific: 'Babies growing in here — please don't feed them, their food is measured.' People rarely argue with babies. If children are visiting, the note gives parents something to point to, and making one trusted child the official watcher who reports anyone feeding turns a temptation into a job. Replace the note when visits end if you want the tank looking clean — but put it back before the next guests arrive.
Brief the people who stay over
Visitors who stay the night are different from afternoon guests: they will be alone with the tank, early, coffee in hand, wanting to help. Walk them through the one-pot system in person rather than leaving it to the note, and show them how little a correct feed actually is — most overfeeding comes from disbelief at how small the portion looks. Tell them the fry will act hungry regardless; begging is what young fish do all day, and it is not a signal that a feed was missed.
After the visit: check the water, not the guests
Once the house is yours again, assume a little extra food may have gone in and respond quietly: check the surface and substrate for leftover flake, siphon out anything you find, and test the water if the tank is small or the babies are very young. A modest extra water change settles most accidents before they become losses. Nobody needs to be told off — the system simply absorbs it. When a helper stays regularly, a KinsLe Care Pass hands them the feeding amounts and the no-extra-food rule in writing, so the briefing never depends on who remembered what.