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Old 01-03-2006, 11:52 AM   #1
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Calcium level

My tank just finished cycling the other day..yhooWhoo!! But anyway, I have noticed a steady decline in my calcium levels. It's now day 17 in my 20 gallon...I used live sand to help cycling. I started using a damsel for cycling, but was told not to use fish, it was old school...so I took him back and bought a piece of shrimp. On 12/26 I started to test for calcium. It was 440 mg/L. Since then it has dropped and today was 260 mg/L. All I have is live rock......Why ??????
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Old 01-03-2006, 11:53 AM   #2
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By the way, I even added Coral-Vite on the 1st (I know it's bad!!) and my calcium level is still dropping.
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Old 01-03-2006, 12:20 PM   #3
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all kinds of calcerous algaes use calcium to form. corraline being the most desireable. That is probably sucking it down. Something else could be that you have a high KH and calcium is precipitating out of solution.
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Old 01-03-2006, 12:24 PM   #4
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My dKh has been high...started out at 16.8 dKH on the 28th of Dec. and today it was 12.6. Is there anything I can do about this ?
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Old 01-03-2006, 01:40 PM   #5
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coralvite does not affect the calcium levels...aragamilk, purple up,kalkwasser, stuff like that will raise calcium.
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Old 01-03-2006, 01:46 PM   #6
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I totally respect your advice Hara...I just figured Coral-Vite had calcium in it, plus other beneficial elements. I now know I should test for everything that I put in the water. but why do you think my calcium levels have been geting lower over time ?
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Old 01-03-2006, 02:31 PM   #7
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As an experiment, test the calcium,KH and Ph in the next water you mix up for your water change, just before you are ready to put it in. Incidently, are you using ro water ? and what salt mix are you using?

I have a feeling that after your cycle is complete and you do about a 50% water change, your levels will be pretty close to where they need to be. I honestly would not be too concerned just yet.
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Old 01-03-2006, 02:41 PM   #8
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I will be doing a water change tomorrow and will test then. I use RO water, not RO/DI, and use Instant Ocean salt mix. I test for alkalinity, is this the same as dKH? Just a mathmatical formula to convert?
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Old 01-03-2006, 02:43 PM   #9
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I'm sorry for my error..is KH the same as dKH
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Old 01-03-2006, 02:45 PM   #10
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The conversion math should be listed on the literature. I actually would have guessed instant ocean, it is not known to have very high calcium "out of the box". It is certainly going to be high enough tho to support a tank with nothing in it that would be draining the calcium. Oceanic salt is much higher to begin with. Before suggesting you switch or start dosing kalk, lets see what happens after the water change.
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