Excellent picture. You got me curious so I did some research on the snails and nudi you have. From what I've read, those snails can't have come from any of them. The lettuce nudi lays eggs in a spiral, (I've had nudi eggs. They look nothing like that), the turbo's lay in a ribbon design and the nassarius are supposed to deposit trails. It can't be the cleaner since they carry the eggs themselves. I did read that stombus snails will lay eggs in a jelly mass that looks like a drop of water but is hard to the touch? Do you have any LR
? Perhaps some hitchhiker snails?