Ok so the idea is definitely out there. I've watched a couple of YouTube videos about this and I think this would be a great unique thing to add to a home aquarium. I have some fears though of flooding my living room or whatever unforeseen problems this could cause.
The idea is adding a glass or acrylic chamber like an old fish tank so the open end is below the water line then sucking out the air so the water fills the empty chamber. Thus allowing fish to swim freely in and out. Simple and easy as that and adding more water. (hopefully)
Most videos show this in an outdoor pond but a couple show this being done in smaller aquariums.
What are your guys thoughts on doing something like this for a 110 gal
saltwater tank? My final vision of this being done is a stack of live rock in pile/pilar formation coming out of the tank...then the chamber being placed overtop and filled with water.