I'm paranoid about my slightly unlevel 200ltr tank as it is, without having that hanging over my head!!! It's amazing though - lucky fish. Best not show the crew, they'll be asking for one next Christmas...
Accually I have seen all of those pictures on a post here before. If I remember correctly, a few members DID indeed try to build something alpong those lines..... but , scaled down of course!!!
it's all about suction. the pipe is installed into the (full of water) tanks.
the air is then sucked out of the pipes, causing water to rush in..... (you would have to keep adding to the tanks to keep this working)
then once the pipes are full..... the ends MUST stay under the water or the suction is broken and the water would be replaced with air rushing in and would over flow the tanks......
wouldnt it be great if that were hooked up to a huge breeding tank of guppy to a huge tank with 1 predator in it? make it look natural, and it would be like what happens in nature