It's a good thing no one told mine that. They hacthed in my tank. I just left them on the glass till they were gone. At some point I guess they hacthed cause there's tons of baby ceriths in my tank now.
Oh and ceriths usually die soon after laying eggs. Mine layed three bacthes over the course of a few weeks. Then died a week or so after.
Baby take awhile to show up, at first there no bigger than a small dot, mine are almost a year old and there still very very small. And yes your clowns probally had a good dinner as well.