Why the snail is missing meals it used to find
A young mystery or nerite snail ranges the whole tank, grazing as it goes, and scattered food is a trail it will cross sooner or later. An old snail is different: it moves less, rests longer, and cruises a smaller circuit, often the same wall, plant and corner in the same order each night. Food dropped across the tank now lands outside that circuit, and by the time the snail's slow patrol reaches it, shrimp and fish have eaten it — or it has softened into the gravel. The snail is not refusing food; it simply never encounters it. The fix is to move the food into the life the snail actually lives, rather than asking the snail to range like it used to.
Pick the spot: beside the shelter, on the route
Watch for two evenings where the snail parks itself during the day and which path it takes when it wakes. The feeding spot belongs right there: beside its daytime shelter, or on the flat stretch of its regular route, close enough that the snail reaches it within its first slow circuit. Consistency matters more than the exact place — the same spot every feed, so the snail's limited wandering is never wasted on searching new ground. Keep the spot away from the filter's strongest flow, which pushes light food around, and away from where boisterous fish feed, so the snail gets unhurried time at the pile.
Making the food itself easier to find and eat
A small, smooth feeding dish — a shallow ceramic or glass saucer sunk level with the substrate — keeps wafers, pellets and vegetables in one detectable pile instead of melting into the gravel. An old snail's grazing is weaker, so favor foods that soften readily: a sinking wafer, a piece of blanched zucchini or spinach anchored under the dish's edge, offered in a portion the snail can work through in a night. Put the food in after lights-out, when the snail's activity peaks and the day-active fish are settling. A tiny pinch of powdered food scattered directly over the feeding spot once in a while can help a failing snail that needs calories close at hand, used sparingly so the water stays clean.
Checking the snail is actually eating
Judge the arrangement by evidence, not hope: food diminished by morning, fresh droppings near the spot, and the snail out on its circuit are the signs the system works. Lift out uneaten food each morning — an old snail in warm water with rotting vegetables nearby is a water-quality problem building quietly. Note, too, the difference between age and illness: an elderly snail that stops moving entirely for days, hangs partly out of its shell, or will not respond to food placed against its foot may be unwell rather than merely slow, and clean water tests plus advice from an aquatic vet are the next step. Writing the feeding spot into the snail's routine in KinsLe through Care Teams means the person covering a weekend feeds the same corner the snail already knows, instead of scattering food the young-snail way.