Either way, it's an adorable, totally unexpected choice for aquarium decor. Place a whole teapot inside the tank, making sure there's plenty of room for the fish to swim in and out of it.

Ask any aquarium keeper, and they’ll tell you that their least favorite part about the hobby is cleaning their fish tanks.

Likewise, the Kaikyokan Aquarium’s listless fish has long been the sole occupant of its tank. But what sets sunfish apart from many other solitary creatures is that they are often stimulated by ...