Housing - Furniture Combos

[Sylfaein]

...Because the floating furniture will instantly snap down and latch onto whatever you placed below it.

I recently built a kitchen, and wanted the aquarium (M size, not XL xD) to be part of the hanging cabinets....

That is MOSTLY true, but there are some things you can do. In my T4 aquarium's last setup, I wanted the Sophia miniature in the middle (and the tank was on the floor). The mini wasn't high enough off the floor to stay floating (she'd snap back to the ground), so I set her on an Oriental Round Table, which was the perfect height. The tank kept snapping to the table until I set the table into the left side of the tank (and moved the mini to the for right edge if the table). I had to leave the table in there, but the tank also stayed on the floor.

And when they add lobsters to aquarium fish, I am TOTALLY putting a lobster tank in a restaurant.

[Atoli]

In my T4 aquarium's last setup, I wanted the Sophia miniature in the middle (and the tank was on the floor). The mini wasn't high enough off the floor to stay floating (she'd snap back to the ground), so I set her on an Oriental Round Table, which was the perfect height. The tank kept snapping to the table until I set the table into the left side of the tank (and moved the mini to the for right edge if the table). I had to leave the table in there, but the tank also stayed on the floor.

Highlighted the difference
When you have a second surface things can naturally stand on (in your case, the floor) it "only" takes some fiddling around to find the right spot for it to latch onto that instead of the other surface.
The problem is when you ONLY have one surface (like the kitchen counter) and want the aquarium to stay afloat above that without any support (like a shelf), it's getting drawn in by the furniture below :x

It even works the other way around, too. Placing an aquarium halfway into a table (to hide the feet in it) had it snap upwards to stand on the table normally again as soon as I exited the housing menu. Which, btw, is something I've done countless times before and never had any troubles with with vases, flowerpots, books and the like.

Aquariums are hard

The tier 4 aquarium was a housewarming gift from a friend. I'm probably the only person who won't worry about the item limit as it takes up half the room lol

That's until you start putting things INTO it..