Fish make quiet pets. Fake fish, or jellyfish, make even better pets. A friend posted this to Facebook today. No one guessed they were fake until she said so. How often does anyone see jellyfish to know better. But, she said they do move. A great fake pet. All you have to do is keep the tank and water clean, but without pet food and poo that won't be such a big job. Take a look at Aquaficial for more ideas in fake pets for fish tanks.