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Originally Posted by Jaws
Ya, that's the method I used. My tank is 180G with about 40G in the sump. My Mg was at 1325, which I reached gradually through adding Mg dissolved in top off water and in biweekly water changes. I was doing an 80G water change this time so I mixed the Mg in the fresh water before adding salt until it dissolved. I added the salt, tested and Mg was about 1400. I added the new water to the tank and tested about an hour after and the Mg read 1470. I tested agian tonight and here's what I got:
Mg 1425
Alk 11.5
Ca 420
NO3 0.5
PO4 0
Do you think I still need to do a water change or should I be ok?
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What salt are you using? IO naturally (at least the 10 or so that I have tested) runs about 1200 so I bump it up to 1380.
Are your corals doing OK now?