A fish lover can choose from small cylinder shaped tanks that can double as a coffee table lamp to wall huge wall sized aquariums. While, there are some basic things that will be included in most kits, such as, a filter, some substrate or coral and sometimes lighting, the kits themselves can vary greatly. Carefully research these fish to ensure that they are compatible for water temperatures and P.H., as well as the food that they eat. Be careful not to put prey and predator together in the same tank. Keep in mind that freshwater fish are hardier than the marine variety, and will be less susceptible to water fluctuations. Look at the fish every day to make sure they appear to be overall healthy and happy. This may seem silly, but the main cause of sickness in fish is stress. So, a happy fish is a healthy fish. Check to see that all lights and filters on the aquarium are plugged in and functioning correctly. Feed the fish daily. However, the time spent waiting will be well worth it when you are later able to display your own coral aquarium. If you follow some simple steps and have patience for about 12 weeks, you will be able to create and own your piece of underwater paradise. To begin, the first thing to do is assemble your aquarium. An aquarium is less of a commitment than larger pets, and can still be a welcome addition to the family home. Aquariums are great learning tools for small children. Kids get excited if they are involved in process. They can learn responsibility by having to help with the chores associated with aquarium care. That waste along with excess food and plant debris become ammonia in the aquarium. Ammonia is toxic to fish and needs to be broken down. That's why the nitrifying bacteria is important. This bacteria, turns the ammonia into nitrites which are more tolerable to fish than ammonia. Next, different nitrifying bacteria will turn the nitrites into nitrates, which are even less toxic to the fish and other aquarium life.