what do you make of this

[flinster]

Ph probe and salifert tests used.
PH lights on 8.1, off 7.8
cal 460
mag 1100
KH 11
cal and KH are too high, right? Mag too low. What do you suggest?

[Zoophile]

The Ca and KH are okay. Mg is a little low. It's commonly accepted that the Mg should be around 3 X the Ca. There's a great reef chemistry calculator that should help you out-- http://home.comcast.net/%7Ejdieck1/chem_calc3.html

[bertoni]

This article covers all the basic water parameters and their acceptable ranges:

http://www.reefkeeping.com/issues/2004-05/rhf/index.htm

The calcium might be a tad high, but up to 450 ppm is in the recommended range, and the test kits aren't all that accurate. I'd raise magnesium with a product like Kent Tech-M or a DIY equivalent.