You can buy a timer from the pet store to make sure the light is on at the exact time each day. Otherwise the lighting could range from day to day and algae will form. Try to position the saltwater aquarium away from direct sunlight as this will also add to the growth of algae. The key to maintaining a healthy saltwater aquarium is to keep it clean and algae free. Be aware of this as you position the coral in your tank and try to keep coral pieces at least 6 inches away from others. As your consider the placement. Also take into consideration the available lighting where they are placed. If you have additional light sources aside from the tube in the hood, bubble coral should do well anywhere in the tank. In fact there are some plant only aquariums. There are many different varieties of aquatic plants. Tubers are a type of plant that needs to be anchored by the root to the bottom of the tank. They may be tied or simply buried underneath the substrate in the bottom of the aquarium. There are also floating plants. Aquarium kits can be purchased at places such as specialty aquatic pet stores, from huge retail chains, or again online. 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. Slow moving or lethargic looking fish will require a stress coat that can be purchased at a local pet store. Try to avoid overcrowding the tank. This should help to reduce the amount of stress caused to the fish. Change about a third of the water in the aquarium at a time, because this type of change will cause the least amount of disturbance to the fish and other inhabitants. The water from the bag could throw off your perfectly regulated water, as well as introduce new bacteria to the aquarium. Watch the fish carefully for signs of stress. Stress causes illness in fish. Monitor their activity levels. Inactive fish or fish hanging out near the surface of the aquarium indicates stress.