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Old 12-22-2013, 11:29 PM   #1
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low calcium level

My calcium level seems to be a bit low
I tested this evening after my weekly 25% water change.
The salt water I use comes pre made from my LFS

PH-8.2
Calcium-380
Alk-11DKH

I only have soft corals in my tank. Just wondering if higher calcium would help my corals or are these number fine for what I have.
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Old 12-23-2013, 11:39 AM   #2
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The more the KH is high, the more the calcium will be hard to maintain as it will tend to precipitate in limestone.
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Old 12-23-2013, 11:41 AM   #3
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According to Chemistry And The Aquarium: Solving Calcium And Alkalinity Problems — Advanced Aquarist | Aquarist Magazine and Blog

Corrections for Zone 3
Zone 3 problems are a little harder to correct, and are fairly common. It is, in fact, the problem in the real question posed at the beginning of this article (it doesn’t say so there, but the alkalinity was 3.2 meq/L). This problem is typically caused by overdosing alkalinity RELATIVE to calcium, but does not necessarily imply that calcium is either too high or too low (though it is almost always too low). To correct problems in this zone, monitoring of calcium and alkalinity values during correction is especially important.

One more word about this zone before getting to solutions: Many tanks end up here because aquarists are trying to correct pH problems by adding “buffer.” In my opinion, one should not try to correct any pH problem by simply adding an alkalinity supplement. If you are low on alkalinity, it is a fine course of action to raise the alkalinity. But if alkalinity is OK, or even high, adding an alkalinity supplement to alter the pH may simply create a worse problem. Better solutions to pH problems are discussed in this recent article6.

If this problem is extreme (i.e., you are far from the line at the right hand edge of zone 3), then water changes may be the best way to correct to the problem. In most cases, however, water changes aren’t necessary.

I would advise correcting this problem by adding a calcium chloride supplement until you have moved into the target zone (or zones 1 or 2 that you can then treat as described above) as shown in Figure 4. Almost any brand of calcium chloride will do (Kent Turbo Calcium, Kent Liquid Calcium, ESV, etc.). Certain other calcium supplements may also be OK (such as just the calcium component of the two-part calcium and alkalinity additive systems), but you do not want to add any alkalinity. You CANNOT use limewater or a calcium carbonate/carbon dioxide reactor to correct this problem. Any of the balanced calcium and alkalinity additive systems will move you parallel to the line at the edge of the zone, while you want to move over to it, and cross it.
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Old 12-23-2013, 11:55 AM   #4
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Those numbers are fine for softies. They don't use calcium like their stony counterparts.
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