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Old 01-24-2013, 02:37 PM   #1
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Hi all, all my water parameters are fine except for alkalinity. I have a 125 gallon mixed reef tank with fish and it has been up for over a year. My mag is 1400, calcium 480, po nitrates are both 0, PH is 82 temp 80.4 F. I use kent marine reef salt with RO/DI water. No TDS's. My alk is 7dkh and use to run in the 8 dkh range. Just wondering how to get back to that range. I do PWC of approx 20 gallons every other week.
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Old 01-24-2013, 03:38 PM   #2
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dose alk.... Do you dose anything else?
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Old 01-24-2013, 04:37 PM   #3
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I do not dose with anything. The 40 gallon a month or 30% water change per month always seemed to keep my parameters in check, it's just been recently that my Alk has been at 7 dkh.
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Old 01-24-2013, 04:40 PM   #4
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What salt do you use? Thats awesome that you can keep your mag and ca that high without dosing...
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Old 01-24-2013, 05:09 PM   #5
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Kent marine reef salt. I order the 200 gallon box for around 50 bucks from pet solutions


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Dissolving 1/2 cup of KENT Marine Reef Salt in 1 gallon (3.8 L) of purified 78F water will yield a solution with the following properties:
Specific Gravity: 1.021 - 1.023
pH: 8.2 to 8.3
Calcium: 425 to 450 ppm
Magnesium: 1,150 to 1,250 ppm

To reach the recommended specific gravity of 1.024 to 1.026 for reef aquariums, dissolve an additional 2 tablespoons (1/2 cup + 2 tbsp) of KENT Marine Reef Salt per 1 gallon (3.8 L) of purified 78F water. This will yield a solution with the following properties:

Specific Gravity: 1.024 - 1.026
pH: 8.2 to 8.3
Calcium: 550 to 575 ppm
Magnesium: 1,350 to 1,450 ppm
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Old 01-24-2013, 06:45 PM   #6
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Nice. I use seachem and have to dose....
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Old 01-24-2013, 07:59 PM   #7
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I use the instant ocean reef crystals and my calcium is always high and my dk is always like 11 I can't test mag but I was told it was related if it was low the dk would be
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Old 01-24-2013, 10:37 PM   #8
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If you have softies and lps they will use the alk to grow. Could be why your low I dose oceans blend usually more alk then calcium .
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Old 01-25-2013, 02:07 PM   #9
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Quote:
Originally Posted by Madreefer420 View Post
I use the instant ocean reef crystals and my calcium is always high and my dk is always like 11 I can't test mag but I was told it was related if it was low the dk would be

I was told the same... So I kept my ALK at 8-9 and ca at 440-460. I was losing coraline so I had my mag tested.... Was at 1080!! So now I dose to keep it at 1350-1400.

Also it depends on the tanks inhabitants. The more corals the more consumption of elements.
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