I am currently concidering an upgrade of my 55 fo to start keeping some live rock which means an upgrade in lights and the addition of a skimmer. I am looking at the prism skimmer and the cpr bak-pak 2 skimmer. Not a lot of price difference, which if either would be recommended? Also how much lighting is recommended for live rock and possibly some polyps and shroms? I have looked at a compact fluorescent fixture with a total of 110watts by All Glass and also at the Hamilton VHO system, this would give me twice as much light but do I really need it for what I want to do? No desire or pocketbook to keep corals. Thanks for your opinions.