We have compiled some betta fish videos in a YouTube playlist.
Interestingly, from the YouTube comments, people are showing the video to their betta fish rather than the human watching it!
The Aquarium section of our blog has also been very popular recently, do check it out here: Aquarium blog posts.
Keeping an aquarium is highly educational for children, in the process kids can learn about biology, chemistry, and math.
Math related aquarium blog posts:
Mathtuition88 