I'm thinking about starting a saltwater tank, and I really like the Oceanic 30 gallon cube but I have a few questions. I plan on getting live rock, so would I need anything other than a few powerheads? Would I need to get a skimmer? Also, I would like to keep some zoas & mushrooms, so how much lighting would I need? I've read that 8wpg is normally ideal for reef tanks, is that correct? The cube tank is only 20.5" wide though, and most of the lights that I've seen are 24". Anyone know of a good light that is about 20" wide? Thanks in advance