I've been seeing these for a while, but noticed tons more recently. Inside the stalks, and even the frilly part of the polyps, there are these circular white balls. I thought it was sand, but the tank is bare bottom, and the little sand I can't get out for the life of me does not look even remotely similar. They are certainly inside the coral and not on the outside, so if it is some type of egg, it must be living inside the coral. There are also a few places where the balls seem to pile up, and there is a clump of 5-10 of them. It's about time I trim back the xenia, so I'll probably cut most of them out in the process, but I'm curious if anybody else has these/knows what they are.