• We are currently upgrading MFK. thanks! -neo

I thinks these worms are eating my snails, can you please confirm?

What you are calling the bottom of the snail is actually the top, in technical terms called the apex. The basal portion is where the aperture is located, and from which part of the soft body comes out for the snail to crawl. So what you are experiencing is erosion and breakage of the apex.
 
What you are calling the bottom of the snail is actually the top, in technical terms called the apex. The basal portion is where the aperture is located, and from which part of the soft body comes out for the snail to crawl. So what you are experiencing is erosion and breakage of the apex.
Thank you for teaching me these. I was always thinking that is the bottom, becuase usually when the snails climbed in the glass, the apex was down, so they are going backward :)

also on the other hand these snails reproduce faster than before. so the babies of the snail all over the tank, but too bad they get breakage in the apex.