The calcium reactor feed was one of my first questions as I wanted it to be gravity. I was told that for the stability of the unit it would be best for it to have a pump. If I added the wavemaker this really messes up the flow to the Ca Reactor if your are trying to rely on gravity alone.
Closed loop - I really like the freedom to move the pumps where needed. I'm going with a variety of corals and with that flow requirements - lots of low flow LPS and high flow SPS. If I don't like the look of the pumps I can just cover them with rocks (I make my own using clay). I can form the clay to any shape I like and have different rock shapes for different pumps. Bottom line - do I need more plumbing that a closed loop would require
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