Rooted plants, like tubers need to be anchored to the bottom of the tank. 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. The aquarium will also need lighting. Again, based on personal preference you can keep it simple or get very technical. Most fish will respond nicely to a basic light that is simply turned on for a few hours each day. An aquarium should contain some form of plants for added interest. The plants serve a place for the fish to seek refuge and feel safe. After the purchase of your tank, you can now consider how you wish to decorate it. Many types of gravel and sand are available in a lot of colors. You can add accent plants as well to make it appear more natural. Many people add little figures or signs to personalize their aquariums. It's all up to you in regards to d cor. Goldfish have a life expectancy of five to ten years. If you do a good job maintaining their fish tank, you should have fun, beautiful fish for a long time. 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. They also possess a strong, hollow ray on their fins that a stinging protein can be emitted from if the fish is irritated or in danger. The most common catfish found in aquariums are the armored catfish. This group is smaller in size than other types of catfish and make a great addition to an aquarium. It is important to choose fish that can withstand high levels of nitrites and ammonia, because these levels are always high in a new tank due to the nitrogen cycle. Debris in the tank from fish excretions help to generate the good bacteria that is needed in order for the fish to survive. Since there are currently no fish in the tank this will take some time.