First off, Welcome to the board.
I recommend reading a book called "Concientious Marine Aquarist by B.Fenner" first and "The reef aquarium vol. 3 by Delbeek and Sprung" these will give you an idea of where you want to take your reef tank and how to get there. They also will explain all of the equipment and methods used today in maintaining a suscessful reef that your family can enjoy.
Ask lots of questions before you mix your first batch of water. And IMO crabs should be left in the ocean.
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M2CW
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