Mystery Egg Case Part 4 - Still Growing

A couple more days in, they're a little larger and more opaque, and some are on the bottom of the cup, but I don't think any have settled (they don't seem to have lost their ciliated mouth parts, at least).
Still not sure what it is, seems like they can survive on the phyto being fed, and the coral frag is looking pissed after being in the small water volume and low lighting.
Cell phone camera of the QT cup, microscope (4x objective), microscope (10x objective), microscope (10x objective and phase contrast).