Overlapping or clipping furnishings may be permanently deleted
From the patch notes:
"Known Issues:
An issue wherein placing a tabletop aquarium on top of another furnishing and then repositioning that furnishing allows the aquarium to clip through other aquariums.
* We strongly advise all players to avoid trying to replicate this issue. All furnishings, including aquariums, that are overlapping or clipping may be permanently deleted when the fix for this issue is implemented."
So, SE is considering deleting 95% of player placed furnishings, because twelve forbid people stack aquariums?
Don't do it SE. Worst idea in the history of bad ideas.