I'm looking at setting up a SW tank. It will be my first. I'll probably be following dorkfish's article on setting up your first marine tank. However, I need some advice on choosing a tank for the setup. I think I'll have room for a 4' tank. Initially I was thinking about trying to find a drilled 55gal, but then I thought since its so deep, it might be more difficult to light. Also, would I be better off using a drilled tank so I can build a sump, or just use a HOB and a skimmer? TIA.