The air pump is probably in the canopy drawing air from there so no loss of vacuum. But should the seal in the canopy break, the floor will be flooded.
Really cool. Yes I see how it would work. The top would have a pump pulling water out and going in bottom somewhere. It works much like a u tub on a overflow box that has a pump to get it going. It would get and keep the air out.
Ahh I get it now - the air added by the bubbles threw me for a while but if the air is being pulled from the tower and then bubbled back in there wouldn't be any net change to the water level.
BUT....
What about dissolved O2 levels? The air being bubbled in there would get pretty stale in a closed air loop.
Another thought....
If the water level was dropping too low in the tower due to air bubbles (like when he used the fish net in the video) then you could pull the airstone out from inside the tower to pull some air and cause the water level to rise back up.
Oh yeah - one other thing - think about how scummy that tower would get in a marine environment. Its basically a protein skimmer with no cup for skimmate removal =)
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