Aquariums are great for kids, a great fish tank is bratz fish tank, it can be set up as a tropical fish tank which you can keep tropical fish in. Aqua one are another good brand, they make aqua one fish tanks and other stuff for aquariums. Also you can try jebo fish tanks. If you do not have enough money for a tropical fish tanks setup, then you would not want to setup salt water fish tanks, you may like to get a custom fish tanks. If this does not appeal to you then just use your computer, you can get fish tank games and fish tank screen saver. You could even put it on fish tank stands. Maybe you should get a fish tank and then get more fish tanks when you get good at keeping your tropical fish.