My astrea snails spawned once shortly after I set up my tank. It made a complete mess of the tank. The snails all paired up in groups of 2-3 a some spewed eggs, others spearm. It never happened again though.
I now have Nassarius, cerith, turnbos, marginta, and a few astreas.
So the nassarius are the most likey egg layers?
Ike, what kind of snails do you have and did you see them lay the eggs?
Louey