Any excess food will become debris in the tank and lead to illness or attribute to excess nitrite levels. You should check the water ph and temp weekly. Any necessary adjustment should be made promptly. Check with your local pet store when purchasing fish to find out what levels are appropriate. They vary amongst fish species. These fish, like true sharks will eat just about anything that will fit in their mouths. Therefore be careful not to house it with smaller fish. The catfish shark should be kept in a tank with brackish water. Brackish water is more difficult to maintain because it is a mixture of both salt and freshwater. Bubble coral may also get flat worms. These worms are easily spotted and usually appear as circular spots on the coral's vesicles. They are not a cause for alarm and usually do little damage if any. However, if you notice a significant amount or a large population of these worms, you will have to take action as they could cause death. This is recommended over buying coral from a store. By growing your own, you ensure it is properly acclimated to your tank. Setting up and caring for the coral aquarium, or reef aquarium is a task that requires a bit of knowledge before starting. There are some steps to take when setting up a new coral aquarium. As their name suggests they simply float in the tank they do not need to be anchored and will not usually require fertilizer. The only regular care required is to make sure that water droplets are not regularly deposited on the leaves, as this will cause decay. Water lettuce and Lily pads are examples of floating plants. Once your plants are established in a clean, well lighted tank, you must care for them by making sure they receive the nutrients required for healthy growth. Plants need both macro- and micro nutrients. Macro nutrients are usually found naturally in tap water and in the fish themselves. These nutrients include nitrates, sulfates and phosphates.