This is undoubtedly some cool technology, but it seems traumatizing for the fish. I have no idea what degree of consciousness a goldfish has, but my guess is a) not enough to be aware it's controlling the movements, yet b) aware enough of the jostling and movement that it's highly panicked. The result is that it's flailing around frantically; its fight-or-flight mode is always engaged.

So I'm a little conflicted here. Love the tech; concerned about the ethics.