Hi, I am going to start a saltwater 20 gal tank, I have a eclipse 1 hood w/bio-wheel filter (is this recommended to use in saltwater?) I saw this lady at a LFS with the exact same tank and exlipse hood and had 2 clownfish in there, so i am wondering if u guys can help me on what to go buy and how much of each. (the lady had live sand, live rock, and no mods to the eclipse hood, ive heard people say i have to mod my hood, if this is true what do i need to mod?? please HELP!!! thanks in advance.