Mag help with new tank

[vulteiv1]

Tank has been set up for about two weeks. I'm using rocks that has been cycling for 2 month in a 55g barrels. Here is the initial numbers:
Day 1
Salinity: 1.026
Nitrite: 0
Nitrate: 1.0
PH: 8.4
Phosphate: 0.10
Calcium: 474
Alk:179
Mag:1000
Amonia: 0

Day 2
Salinity: 1.026
Nitrite: 0
Nitrate: 1.0
PH: 8.4
Phosphate: 0.10
Calcium: 410
Alk:161
Mag:1000
Amonia: 0

Day 3
Salinity: 1.026
Nitrite: 0
Nitrate: 1.0
PH: 8.4
Phosphate: 0.10
Calcium: 394
Alk:142
Mag:900
Amonia: 0

Day 4
Salinity: 1.026
Nitrite: 0
Nitrate: 1.0
PH: 8.4
Phosphate: 0.10
Calcium: 369
Alk:134
Mag:800
Amonia: 0

So my question is, is it possible for Mag to drop that fast within 4 days? I'm using Elos test kit to test my Mag readings. Should I bring up my Mag level first and retest and slowly dose Alk and Cal? Or do I bring all three up all at once?


http://i259.photobucket.com/albums/hh315/vulteiv1/fts_zps4ee300a6.jpg (http://s259.photobucket.com/user/vulteiv1/media/fts_zps4ee300a6.jpg.html)[/QUOTE]

[bertoni]

Those numbers look more like testing errors than anything else. The kit might be bad. The only way for magnesium to drop that quickly would be water changes with a bad batch of salt. Magnesium at 1000 ppm is very strange by itself. I'd get a second opinion on the kit before worrying much.

[vulteiv1]

Yeah, that's what I'm thinking too. Nevered had this kind of reading for Mags ever. I will go get another test kit tomorrow. Thanks for the quick reply.