Like I stated in my profile and intro thread, I am 100% new to the marine tank thing. I was wondering if anyone could explain about them for me. I know that they are COMPLETELY different from maintaining a freshwater tank. Not just with the addition of salt to the water, but also the lighting and current. I guess some of my main questions are: - How does marine lighting work and how is it different from freshwater - What is a protein skimmer and how does it work -What is live rock and live sand? I've also done a bit of digging on coral. I originally just thought they were exotic plants of some kind, but after reading up a bit I realized they are nothing like plants. Some are mobile, they eat food, some have personalities and react to different stimulus. In fact, they seem to be somewhat similar to actual fish as far as care goes. So can anyone give me some details on what coral actually is? Will it continue to grown indefinitely? Once it reaches a large size, is it possible to reduce the size and start again from a small size? (I'm not sure about this one, I think I saw a thing on tv way back on how to prevent destroying natural coral, they break off small segments of it and those small segments would eventually grow to a full piece of coral again) feel free to burst my bubble btw. I don't have anything to start a tank yet so I haven't set myself up for a reef catastrophe yet.