How is the tank for flow? Sometimes, especially in the lower tank areas and on the sandbed, cyano can grow in areas that aren't receiving as much flow.
What salt are you using? Odds are that if you are doing regular waterchanges your magnesium levels might not be off by much. You might want to take your water in to get tested for that as well.
What is "normal" alkalinity? I had heard reports that xenia likes higher alkalinities, I'm not sure if that rings true.
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