Hello
and Welcome
Decide on what you want in it long term.
Add Live Sand (if you want a sand bottom)
Add Live rock
Get rid of Bioballs and any other "media" in rear chambers.
Get a good quality salt mix and mi your water... add it to tank and then watch it cycle
In the mean while go to
Newbies, a little something on cycling/breaking in a new reef tank.
and read all about this new thing called a Cycle... read it.. learn it.. LOVE it! it's a VERY integral part of EVERY aspect of the Marine Tank. The better you understand it now the better off you, your tank and your WALLET will be
Again WELCOME