Why Have Snails Appeared in My Aquarium? How They Got In and Why They Multiply

Ramshorn snail on an aquarium plant leaf

Snails usually arrive as hitchhikers: adults or clear jelly egg clutches on live plants, decor or substrate from another tank, or in a fish bag. Eggs can take one to four weeks to hatch, and a sudden crowd usually points to leftover food.

Why Do Snails Die in an Aquarium? Copper, Soft Water and Other Causes

Ramshorn snail in an aquarium

Snails usually die from something in the water: copper from fish medications, soft water short on calcium, ammonia or nitrite, a sudden change when they are added, or too little food. Test the water first.