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. It usually takes about four to six weeks. Once you have purchased your fish, let them float on the surface of the tank in the bag for about fifteen minutes. Change approximately one third of the water in the aquarium every one to two weeks. Water from the tap should be treated accordingly before adding to the tank and adjusted within two degrees of the aquarium. Again, check with your local retailer when purchasing fish. Some treatments allow the tap water to be ready in as little as an hour, while others need to sit overnight before being added to the tank. between 8-8.4 and a salinity content of 1.024-1.025. Luckily they do eat the same food. They feed off of a diet of small pieces of raw fish, shrimp, squid and mussels. When keeping cold water invertebrates such as the species mention above, it is a good idea to keep a separate tank full of shrimp, mussels, and scallops to be used as a food source, if you wish to use fresh rather than frozen foods. The next item on the list of raising a healthy fish is keep the water properly regulated. It is imperative to keep the salinity levels, P.H. and temperature consistent in a saltwater aquarium. Test the water daily and make any necessary adjustments immediately. Check the water for cloudiness and clean the filter regularly. 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. The population of these sharks has dwindled in recent years, due to fishing activities. Therefore they are being considered for the endangered species list. It would be irresponsible to attempt to house one of these creatures, unless fully educated on their care needs. Sand sharks adapt the best of all sharks to a captive environment.