I have these two little guys and I have no idea where the smallest one came from. I got the bigger one on accident with some salvinia (which they have almost completely eaten). I have recently found some clear sack like looking things attached to the sides of my tank so I took them out assuming they are eggs but these snails can’t possibly be old enough to reproduce? I’ve only had the biggest one since May 5! I just found another one, the size of a pin head. Here’s a picture of what the possible eggs look like(along with some substrate, oops!)