When I was a baby my pops had a nice size monster tank, I think like a 300gal or something anyway, my mom said she would just sit me near the tank and I would just zone out for hours. Guess the Oscars were my baby sitters, while my mom was doing house chores. Anyway it still works now, I can just zone out on the fish, water, and the sound of the water flowing. it's hypnotizing.