Step 2 (Removing your fish) This may be the most important step in the cleaning process. It is time to remove the fish from the tank. The first thing to do is make sure that the container in which the fish are being placed has water that is about the same temperature at the tank, other wise your fish will go into shock. It is suggested that the roots be tied to pieces of rock or wood. These species usually grow to be fairly tall and will add length to an aquarium. When planting these, remember to allow plenty of room for growth. The roots will grow outwards and require additional space. Another type of aquatic plant is known as cuttings. Any uneaten food will sink to the bottom and rot. Keep this to a minimum. Watch your fish the first few times that you feed them. Feed only as much as they will eat in two to three minutes twice a day, or as recommended on the Goldfish food label. Be especially careful not to overfeed when the Goldfish tank is new. Stay away from under gravel filters because they produce a steady flow of bubbles that disturb the surface. The filter plate on under gravel filters also limit's the composition of the gravel in which the plants are rooted. All other kinds of filtration systems will work well. The only things to be concerned about are if your filter causes too much disruption to the water surface. Allow the tank to cycle until the water is no longer cloudy and sufficient P.H and water temperatures have been established. Now it is time to purchase the fish! Buy hardy fish such as danios, barb, gouramis, and live bearers. They should be able to withstand the high nitrite levels and ammonia in the new aquarium. Just to make sure, check that you have a filter and an air pump. These are the most important pieces to the whole set up. If you are buying your tank as a kit, make sure it is specified to be a coldwater set-up. You will notice that no heater will be included. After the purchase of your tank, you can now consider how you wish to decorate it.