thinking about turning a 20g long into a Sw tank. Right now it has a 65w 50/50 10000k PC light fixture on it. I was wondering what a few of my options may be. Also, would I need a protein skimmer for such a small tank? I like clown fish a lot, those file fish and such are neat, and I also like some of the dwarf angels. I enjoy star fish a lot, shrimp, crabs etc. I would like to try some corals if at all possible. Basically I want to do the best thing I can possibly do with that tank. I would most likely be willing to purchase another lighting fixture as well for it if need be.