Currently, we have a 55 gal fish only tank with crushed coral & shell substrate, a few fake plants, an ornamental rock, a fake tree stump, a Flame Angel, a Banggai Cardinal, a Percula Clown, a Cleaner Shrimp, a few Hermit Crabs and a couple of Turbo Snails. I am considering going to live rock. I'm not sure what the advantages or disadvantages are. Would I need special lighting, or is that only for Corals? Would I need a protein skimmer or is that also only for Corals? Any insight, advice or just plain old info would be great.