It's all about personal choice here as they come in many sizes and shapes. When you purchase the tank, a kit often comes with it and includes some of the other things you may need. 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. These facilities have the resources to build large enough tanks to house the sharks. Sand sharks can be kept in a tank with other large fish. The sharks are usually fed three to four times a week to discourage them from eating tank mates. For the most part this works well, although, every so often some of the fish seem to disappear. It may take a little while for the fish to adjust to the new water, but after having followed all these steps, you can be sure that your tank is clean and healthy. You won't have to completely clean your tank for another 2 months. Always remember to change the filters if they are dirty. As an added tip, if you remove 20% of the water every month and replace it with clean water, this will cut down on the complete cleaning of the tank in the future. When you are ready to add the water to the tank, follow these simple steps. First, pour the sand into the bottom of the tank. Add dechlorinated water to the tank. Next, add the salt and make sure it is mixed until the specific gravity measures 1.205. After the water and salt are added, arrange your live rock as desired and install the heater and the hood of the tank. They vary amongst fish species. Filter cleaning is extremely important. Filters collect waste excreted by the fish and left in the tank in the form of excessive fool. The filters will eventually fill with debris and be unable to do their job unless they are cleaned. In addition to eliminating waste, filter sometimes act as an aeration device cycling oxygen through the tank. For bubble coral, feed it shrimp or small pieces of clam one to two times a week. Place the food morsels on the polyp of the coral. Any food that is trapped by the tentacles or among vesicles, will be eaten almost immediately. It is important not to overfeed the coral or your fish. Algae is a pest that will cause damage or even death of the coral.