I stick to things that can't scratch, don't bite and smell. I have Lion head and bubble eye goldfish, in fact my photos have even be used in promotional material and magazines becuase they are so freaky looking. Click here to see the peculiar faces. I have to admit sometimes they are a bit smelly but really, goldfish get to know you better, they come when you sit in front of the glass, they are so graceful when they float. If you are a pothead, I'm not saying I am by the way but you can sit infront of the tank and watch them glide forever, very peacefully and calm. It's easy to are for I have a Eheim filter which is very strong becuase goldfish are the dirtiest fish out there, but the work is totally worth the calming effects. Of course if you don't have the space or money, then just look at the virtual tanks online http://www.virtualfishtank.com/fishtank/fishtank.html although you'll be staring at your computer screen all day and that why you leave work, don't you?