Understanding Shell Health: Pitting, Growth Lines, and Calcium

A Mystery Snail’s shell is a living record of its life. Like the rings of a tree, the shell tells a story of the environment the snail has lived in, the food it has eaten, and the minerals it has had access to. For many keepers, identifying what is "normal" can be the first step in successful snail keeping.

What is "Pitting"?

One of the most common observations in the hobby is "pitting"—small, pin-hole-like indentations or a white, chalky appearance on the older parts of the shell (near the spire). In our experience, this is often a sign that the water environment is slightly too acidic, causing the shell to slowly erode over time. While you cannot usually "reverse" existing pitting, you can certainly support the snail in growing a stronger, smoother shell moving forward.

Growth Lines: The Snail’s Timeline

When a snail moves from one water source to another (like moving from our studio to your home tank), it’s common to see a "growth line" or a slight change in shell texture or color. This is typically just the snail adjusting to its new parameters. Smooth, consistent growth is generally a sign of stable water chemistry and a mineral-rich diet.

The Role of Calcium

Because their shells are made primarily of calcium carbonate, these snails have a high biological demand for minerals. While they do absorb some calcium through their gills from the water, providing calcium-rich supplements or botanicals in their diet is a common practice among enthusiasts to support shell density.

Monitoring Your Studio

Every aquarium has its own unique balance. We suggest observing your snails' shell growth weekly. If you notice new growth is coming in thin or translucent, it may be a general indicator that your water parameters or mineral levels need a closer look.