ramshorn snail

Hi. Recently I’ve noticed that the snails in my 10 gallon planted tank haven’t had the best looking shells. How can I add calcium?

The ramshorn snail is often seen as an aquarium pest that people want to avoid. However, they only pose a problem in an aquarium that is unbalanced. When the aquarist adds too much food to the tank, the ramshorn snails take advantage of the abundance and breed at an alarming rate. Population...