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good artical gregt, One thing a lot of people dont know about calcium is that in order to keep or raise your calcium to the 400-450 level you have to maintain your stronium level. It is a complicated formala, but in lay terms you need to have your stronium at the proper level or your calcium will not raise or maintain. This is probibly why you had sucess when you did water change (you were adding stronium as well as other trace elements). If you dose with a stronium additive bring up the level you will have sucess with raising and maintaining your calcium.
It is true that different light levels will produce different types of calcerious algea. your purple corraline perfers lees light but it will still grow under intence light, just not as fast
From what I have read the rock Portion of Live rock does not play a big part in filtration, but the animals (micro algae, corraline algae, calcerious tube worms, fauna, ect) provide the filtration that we all desire.
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