This thing is pure evil! The part with sand doesn't even have water in it, and the instructions even says to only change 3/4ths of the water once a month!! Their care information is also all wrong, and even calls bettas "puddle fish." Why is it so evil, it kills me!! :( :( :(
Edit: I did send them a message though, which I posted below. Hopefully they will get back to me.
Your betta care information is inaccurate, and this product is inhumane. Bettas are tropical fish that require 2.5 gallons of water, temperatures in between 78-85 degrees F, and 100% water changes once every three days minimum.
Bettas also are not "puddle fish", they live in canals and rice paddies, which are shallow but actually quite large and expansive.
I would not buy this product or suggest it to anyone, especially since your animal care information is incorrect.