High Mag

Discussion in 'Reef Chemistry' started by nly04, Feb 6, 2017.

  1. nly04

    nly04 Guest

    I recently switch Salt from Microbelift to Aquavitro then now Instant Ocean. I have high magnesium problem. Alk is 8.5, Cal 450 but Mag is 1500-1600. How to safely lower magnesium?
  2. rygh

    rygh Supporting Member

    Water changes are the only realistic way.
    No big hurry, a bit high Mg is no big deal.

    Suggest instant ocean regular, not reef crystals for a while.
    Regular IO is a bit low in magnesium.

    But since you mentions IO: Was that regular or reef crystals.
    If it was regular, I strongly suggest you test with a different test kit. You may not really have high Mg.
    Coral reefer likes this.
  3. RandyC

    RandyC Supporting Member

    Probably only way is large water changes, it'd probably take a while (months) for it to decline by coral usage. Are you seeing a problem with any coral? How did the Mg get so high in the first place? Dosing?

    I'd be inclined to say, if it ain't broke (coral look fine), ride it out and follow normal WC schedule.
    Coral reefer and WrightReef like this.
  4. Mine was up in that range as well for a couple of months. Didn't hurt a thing. Just brought it down slowly by adjusting dosages.
    WrightReef likes this.
  5. roostertech

    roostertech reef noob

    Both variant of IO salt has very inconsistent parameter. There is a long thread on that on RC. My latest batch of reef crystal has 1300 mag.
  6. rygh

    rygh Supporting Member

    Do you happen to have that thread?
    From all I have read, and many years of using IO-normal, it has been very consistent. One of the big advantages.
    The reef-crystals on the other hand has been problematic.
  7. roostertech

    roostertech reef noob

  8. rygh

    rygh Supporting Member

    Thanks for finding that.
    Hmm, a bit scary.
    I always add a bit of Mg when mixing salt, so I do expect regular IO to be low, just not horribly low or inconsistent.
    I rarely measure tank Mg. Maybe time to measure more often.

    One note: I always use the entire bag. So no content settling issues.
  9. tankguy

    tankguy BOD

    that mag level is fine. I've ran that level for years
    Coral reefer likes this.
  10. Coral reefer

    Coral reefer President

    Even if it's maybe 10% above the high end of what we want, our tests are not that accurate. Just try to keep the "number" the same
  11. Vhuang168

    Vhuang168 Supporting Member

    That level mg is fine. Mine is @1600+. I keep it high because I run alk at 9.5+ n Ca at 450+ to reduce the risk of precipitation if alk climbs too high.

    Sent from my iPhone using Tapatalk

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