The final notes make it sound even scarier...

If an estate contains overlapping aquariums, all furnishings in the estate that are overlapping or clipping, regardless of whether they are in proximity to an aquarium, may be permanently deleted when the fix for this issue is implemented.
First thing I'm doing upon logging in is moving the current aquarium in my private, FC, FC Room and apartment into storage until after the fix. Assuming the fix is coming at a later date...