We actually really enjoy our fish tank. It was a bit of trouble to set up, but fun if your child likes to use the water testing kit and have a little scientific record and so on. And the fish have more personality than you might think. There is quite a bit to learn about fish tanks and fish, but the upkeep is not very difficult. You just change 25% of the water once every week or two and change filters, feed the fish, scrub the walls.