Another Newbie Question

[reefgirl189]

All my research points to the fact that if you want to grow corals, you have to have great calcium levels. You need to buy a fancy smancy calcium reactor or dose kallwasser, etc.

Why is it that so many members on this site have tanks that make me drool, with beautiful soft, LPS and even SPS corals that look like they are thriving and all you (general you) have in your setup is some decent to good lights, a skimmer and live rock? How do you guys do it? Am I thinking too complex when it's really quite simple?