Its recommended, The more reading you do the better you'll understand everything. This website will offer you plenty of information if you are willing to read
You dont have to, the rock will still be alive without light, what the light does for liverock is the coralline growth. It wont hurt to have some light on it.
Blown 346 is right on it. I lighted mine for just 4 or 5 hours to keep the algae down. Coraline does not need long hours of light to grow. Some folks think it takes very little actually.
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