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  1. #1
    Junior Member
    Join Date
    Feb 2006

    Calcium, Alkalinity and Magnesium problems

    Hi there,

    I have been having trouble the the Calcium, Alkalinity and Magnesium levels in my tank.
    I use Kent Sea Salt mix in the 200gal bucket and have been using Kent for some time with good success. However, around the middle of September 06 I noticed that the Calcium levels were rising in my tank...I didn't pay too much attention to it at the time...just figured it was one of those things. When I noticed the Magnesium levels rising I began to get a little concerned.

    I've tested a batch of water I mixed up to do my water change before I added it to my tank and noticed that the levels are as follows:

    Calcium 560ppm
    Magnesium 1500+ppm

    Does Kent Sea Salt mix contain calcium above 500ppm and magnesium above 1500ppm? Could I have gotten a couple of bad buckets of salt mix? I haven’t changed anything else in regards to my tank.

    Here's a little history on my tank:

    I have a one year old 90gal mixed reef tank with lots of fish, inverts and corals
    I am not using a sump so all my equipment is hang-on
    I am running 4 110w VHO lights on about 10 hours a day
    I use a Corallife Super Skimmer 220
    I use an Eheim 2217 canister filter
    I use a Phosban Reactor 150 to remove phosphates
    I use RO/DI water with a salinity of about 1.022
    I change the water every three-four weeks
    I use Kent Sea Salt mix
    I use Salifert test kits

    On a weekly basis, I add the following Kent products:

    Coral Accel
    Coral Vite
    Strontium & Molybdenum
    Essential Elements
    PhytoPlex twice a week
    MicroVert twice a week

    I also use Seachem PH 8.3 Marine Buffer to maintain PH at about 8.3

    My levels are as follows:

    PH 8.3
    Alkalinity 11.8dKH or 4.23meq/L
    Nitrite 0
    Nitrate 0
    Ammonia 0
    Magnesium 1500+ppm
    Calcium 560ppm

    I’m a little concerned that the Calcium, Alkalinity and Magnesium levels are so high…they may be adversely affecting my corals and fish!!! Any suggestions???

    90g mixed reef tank
    4 VHO fluorescent Actinic
    Corallife Skimmer 220gal
    Eheim filter 2217
    2 MJ 1200
    1 ZM PS 40
    150lbs LR
    Yellow Tang; Desjardin Sailfin; Blue/green Chromis; Clownfish; Threadfin & Copperbanded Butterfly;
    Sandsifter, Brittle & Serpent Starfishes
    Coral Banded, Blood, Peppermint, Cleaner & Anemone Shrimp; Sally Lightfoot, Anemone, Emerald Crabs
    Scarlet Red, Metallic Blue, Red, Blue & Orange Legged Hermit Crabs and some snails
    Far too many corals and frags to list

  2. #2
    Senior Member
    Join Date
    Nov 2005
    Are coral excel and vital calcium and alk supplements? If not what are doing for calcium and alkalinity additions. They should be added in balance to each other so the numbers are always balanced. Once one goes out of what it affects the other two (but mainly alk and calc). What testing equipment are you using?
    Randy holmes farley has a good forum (chemistry) at reefcentral. You can follow his techniques for alk and calc. additions. If done properly you should remain at optimal levels. BTW all those values may be high but wont hurt too much. Just bring them down somewhat slowly. Then when everything is where it should be start adding a balanced supplement.

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