Watch fish in this inverted aquarium, aka a fish condo

YouTuber Kitty Loves Tofu set up this inverted aquarium in an indoor koi pond then put some food inside. After a few early adopters benefited from taking a chance and swimming in, their neighbors decided to join in, too.

If you're wondering how to do this, here's a classic how-to video on creating one in an outdoor koi pond. The effect is even more impressive in the brackish water, and it's interesting that the tadpoles were the early adopters in the pond.

Inverted Aquarium In My Pond (YouTube / Kitty Loves Tofu)