If your using dosing pumps then how are your numbers fluctuating so much? How often do you dose mag? Mag being low will make your other numbers fluctuate/deplete more.I do use a doser from BRS
How do I send the water for the triton test?
You should read this http://reefkeeping.com/issues/2004-05/rhf/
I know you already know this stuff more then likely but you can never have enough knowledge. Acro's especially need very consistent Cal, Alk and Mag

