A snail carries its health on the outside, which makes a weekly check unusually informative once you know where to look. Work in the same order each time, shell first, then body, then the water behind both, and observe in the tank under normal lighting rather than lifting the snail out, since a settled snail shows its true posture, grip and appetite.
The Shell: Growth Edge, Cracks and Apex
Start at the shell's growing edge. The growth edge at the opening should appear smooth, unbroken and similar in colour and thickness to the shell behind it; a thin, ragged or translucent edge suggests the shell is being built faster than minerals allow or is dissolving as fast as it forms. Run your eyes, not fingernails, along the whorls for cracks, chips and pitting, noting any mark that is new since last week.
Finish at the apex, the pointed tip where the shell began. Chalky whitening or crumbling there is erosion, and because the apex is the shell formed at the very start of life it shows water problems first. Photograph the shell from the same angle weekly; erosion moves slowly, and only comparison reveals it.
The Body: Foot, Tentacles and Appetite
The foot should look smooth, evenly coloured and active, spreading fully against glass or substrate as the snail glides, without swelling, ragged edges or pale patches. A snail that grips firmly and cruises the tank is demonstrating health more convincingly than any single body feature.
Tentacles should extend fully and withdraw briskly when they meet an obstacle or a gentle touch nearby, then re-emerge. Appetite completes the picture: a healthy snail finds food, feeds with its rasping mouth visibly working, and produces normal droppings. A snail that stays retracted, floats, or ignores food it usually takes has given you a finding, even if the shell looks unchanged.
The Water Behind Shell Health
Shell is built from the water column, so log the parameters that drive it beside each weekly check: pH, and the hardness measures, GH and KH, that describe available minerals. Soft, acidic water draws minerals out of shell; stable, suitably mineralised water lets the snail lay down strong new growth. Temperature matters too, since warmer water speeds metabolism and growth alike.
If several snails show shell change together, read that as a water signal before a snail signal. Test first, compare against previous weeks, and correct water gradually, since sudden swings stress every tank resident.
What Change Routes to Action
Route by pattern. A single snail with a chipped edge but strong appetite and firm grip earns a note and a recheck. Erosion spreading at the apex, a soft or ragged growth edge, or appetite fading across the tank earns action: retest the water, correct parameters slowly where they have drifted, and review dietary calcium as ordinary husbandry, through the foods and mineral sources suited to the species you keep.
Kept with dated photographs, those weekly entries in KinsLe's Pet Passport form a shell history that shows at a glance whether husbandry changes are working, which is the real purpose of looking every week.