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I don't know how to insert a quote but I don't think this was responded to-
"Is a big flucuation in pH a problem for SPS corals or should it just be ignored and worry about alk calcium and magnesium(those are very stable right now)"
I think ph would be the first thing you need to test for and look at. I have most of my books in storage right now or I'd look up Anthony Calfo's quote on this. His point is so clear because of his eloquence. Now if I remember how he said it (not sure of the numbers involved), however his analogy on ph was the difference (perhaps in a point difference in ph?) was comparable to sitting on a nude beach in Miami naked and then instantly being transported to the frozen artic, still naked. Don't underestimate the importance of ph.
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