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Old 03-07-2015, 04:27 PM   #11
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Alkalinity chemistry question

Kalkwasser doesn't raise carbonate hardness. It does add a excellent source of calcium. The ph controls how much calcium is dissolved back out of the substrate, if it's aragonite. But that doesn't happen unless ph gets below 7 at which time you have other issues.

A KH of 5 will nuke your LPS, but you know that already. Start adding soda ash or properly prepared baking soda. This can be bought for pennies. Slowly, over a week. I suggest shooting for 9-10Kh. Monitor calcium as that may tend to drop as hardness increases. You need to also check to see that Mg levels are about 1300. All three of these relate to each other. The proper Mg levels decreased the "see saw" effect between calcium and carbonates.

But with a light coral load, you might consider increased water exchanges with a reef salt that's higher in hardness.


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Old 03-07-2015, 05:01 PM   #12
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Salt mix plays a part as well, as it will have differing numbers for these elements. Though I really like Kent's salt, the low alk that comes with it seems to keep me in the lower than wanted alk area.
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Old 03-07-2015, 06:49 PM   #13
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Originally Posted by Gregcoyote View Post
Kalkwasser doesn't raise carbonate hardness. It does add a excellent source of calcium. The ph controls how much calcium is dissolved back out of the substrate, if it's aragonite. But that doesn't happen unless ph gets below 7 at which time you have other issues.

A KH of 5 will nuke your LPS, but you know that already. Start adding soda ash or properly prepared baking soda. This can be bought for pennies. Slowly, over a week. I suggest shooting for 9-10Kh. Monitor calcium as that may tend to drop as hardness increases. You need to also check to see that Mg levels are about 1300. All three of these relate to each other. The proper Mg levels decreased the "see saw" effect between calcium and carbonates.

But with a light coral load, you might consider increased water exchanges with a reef salt that's higher in hardness.


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Yes, 5 KH was a disaster to my hammer and frogspawn. Really frustrating. It just got my by surprise. My tank has so much corals, there is hardly any room for any more. Just ordered the dosing kit from BRS. I will try to aim for 450 calcium and 9 kh. Does that sound good or should kh be 10? I just got my MG test kit so let's see where that is at! I use Red Sea coral pro, so of course it has elevated levels. I usually do a water change once a month %25. Guess dosing was the missing element.
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Old 03-07-2015, 07:04 PM   #14
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I made the same mistake the first time I ran GFO. It can also lower alkalinity.


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Old 03-07-2015, 07:18 PM   #15
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Mg is at 1470, just did test.
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