Dosing - can't find the right levels.

[doch]

I'm stumped. Big time.

I recently upgraded and up until this point, had no trouble at all finding the right amount to dose in order to maintain proper levels (Ca ~400, dkh ~7-8, and Mg ~1350). Since the upgrade, everything is FUBAR.

My Mg skyrocketed to 1900! I turned off the Mg pump, did a water change, it came down to 1700... kept the pump off. 3 days later, did another water change, tested again - 1850. WTF!? No Mg coming in, and it raised. Does new glass and or silicon leach Mg into a tank?? (J/K. I think)

My Ca has been all over the place, but within semi decent levels, so I'm sure that it will settle in with time.

Alkalinity.... again... WTF? Had my pump set for 30 minutes, tested, it was at about 5dKH. Added some Reefbuilder or whatever it's called (the raise alk one), and upped my dosing time to 35 mintutes. Waited 3 days, tested again, 5dKh. F. Did a water change, tested, 5. Added some more reef builder... time will tell with the result.

I'm getting... wait, I AM frustrated. Is there a step that I'm missing? Are my test kits shot? Am I on some serious drugs? I'm lost... please help.