I wonder if nassarius snails find a mate and then lays the eggs? I also have cerith snail eggs on the glass but they are already falling apart and going away. Nassarius snail eggs are still there. I wouldn't have known what they were, if I didn't catch her laying them. I know that some of the mexican cerith snails survive because I have a bunch of babies all over the rocks and glass.

Yeah, I don't know how snail reproduction works either.
I only have two clown fish in my 120g. Everything else in the tank is just corals, a serpant star, conchs, snails and anemones.
maybe bristle worms will eat them?
I will check on the eggs every day to see if any survive.