My snails are ceriths (I've seen those eggs they are different) and astreas and a turbo (had those a long time and never saw any eggs)
I just put a lettuce nudibrach in my tank about a week and a half ago. But I havent seen it hanging around the glass much. I usually see it on the rockwork.
Could it be the lettuce nudibranch? If so, do the eggs often survive?
On the other hand, could it be some nasty nudi in my tank that I dont want? Seems like kind of a coincidence though, just got the lettuce nudi and now this.