I'm not surprised you're seeing such a range for xenia. That stuff can grow in a toilet, and it's the bane of many reefers.
In general though, we try to go for natural seawater parameters. Except that most folks keep alk, Ca, and Mg a little higher than normal.
Something like:
Temp 78
Salinity 35 ppt
Alk 8.5 dKH
Ca 450
Mg 1350
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Pat
Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
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