Stress is the most common cause of sickness in fish. Remember that these creatures may have come directly from the ocean, and it may take a while for them to get acclimated to their new home. Another cause of stress in fish is overcrowding. Make sure there allow about ten gallons of water per one inch of fish. If you are a beginner, it is recommended that you start out with some hardy freshwater fish, but don't buy the fish just yet. You need to set up the aquarium first. Most aquarium retailers will sell an aquarium in the form of a kit. This takes the guess work out of purchasing. In order to get your tank ready, first rinse out the tank with clean tap water. Make sure to feed them correctly and keep their water fresh and clear. When starting any new aquarium, you should get everything in place before buying the fish. If you are going to put gravel on the bottom, you may want to put only a thin layer. This will make it easier to keep clean, as Goldfish tend to be messy. Colored rock or dead crushed coral make a nice addition to the aquarium, and may help to make the fish feel more at home. A few varieties of guppies are the Fantail, Flagtail, Spadetail, Deltatail and the Roundtail. The names of all of these different types of guppies focus on the tails because they are so remarkable and unique. These foods can be purchased in flake, tablet, or frozen forms. In addition, there are vitamins that can be added to the foods to replace any nutrients that may have been lost in the freezing or drying processes. Just as we humans don't like to eat the same thing every day, neither do fish. Keep a variety of food handy because they will not eat the same food daily. Add dechlorinated water to the tank. Next, add the salt and make sure it is mixed until the specific gravity measures 1.205. After the water and salt are added, arrange your live rock as desired and install the heater and the hood of the tank. After doing these things, you must then wait 4 weeks to move ahead.