If it is your first time to watch dolphin fish, I suggest you keep a green puffer fish (submarine) or a chocolate doll (mini puffer fish). These two kinds of fish are common in the market, cheap and simple to raise. Both kinds of fish can be raised in fresh water, submarines like hard water, and it is best to add some sea salt. If you don't add salt, it may affect your life and state, but you can feed it. Chocolate dolls like weak acid water and snails. All puffer fish do not eat artificial feed and are not vegetarian. There are about 4-5 chocolate dolls in 25 yuan, 1 in 5 yuan and1in 0 yuan, all at popular prices. Other kinds of puffer fish are more dependent on salt than submarines, so there is a considerable demand for aquarium equipment. There is a puffer fish shop in Beijing Guanyuan Flower, Bird, Fish and Insect Market. There are not many varieties, but the price may be twenty or thirty times that of submarines, and the appearance is average. I suggest you start with the submarine and accumulate some experience in raising and watching dolphin fish before you get to know it.