Magnesium over 1600?

My Red Sea test kit is showing Magnesium at over 1,600. If I did calculation correct its actually at 2,000!! I've tested it twice and got the same exact result, and looked online to be sure I was doing the test right and I am. The bottom of the plunger touches the 1ML mark, which accounts for the long tip. I am dosing with Peroxide at the moment could this affect the test? Always used Red Sea Coral pro salt, never had anything besides FOWLR in the tank since it first was started.

Here are my test results.

TEST ENDED: 12:30
TEST DATE 3/3/2013
ALK: 10.5
CA: 450
MAG: 2000
AM: 0
NITRA: 0
NITRI: 0
PH:8.0
SAL: 1.025
TEMP: 80

Current tank inhabitants: Snowflake eel

Recent changes: 2 new power heads and 2 new heaters

 

My Red Sea magnesium test kit consistently shows 300ppm more than Salifert. I mixed fresh batch of d-d h2ocean salt at 35ppt and Salifert showed ~1350 in line with advertised on salt box. Red Sea showed 1600+. I bet yours is in 1700 range.

 

if your alk and ca are where they are, I highly doubt your mag is that high. 1700 like stated above, maybe but not 2000.

 

Id try another test kit. Be really tough to get mag that high

 

This has been happening in my tank, using a sea chem magnesium test and red sea calcium test. My magnesium ranges from 1500-1800 depending on how recent the last water change was. It never goes below ~1500 and my calcium also is always high, around 450-480. I use kent marine salt mix and run algae scrubber and refugium with no chemical filtration. My theory is that my RO filter is breaking down as the total dissolved solids are kinda high in its water, thus calcium and magnesium among other trace/essential elements are not being removed by the RO. I could test calcium and magnesium in the RO water, but I'm lazy and my corals seem to like the extra element input.

 

I know that's not my problem as my spectrapure is putting out 0 TDS. Can our kits test freshwater?