calcium sources? - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 05-30-2011, 04:12 PM Thread Starter
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calcium sources?

Hello!

I was just wondering if there are any common materials I might be able to find to dose calcium into my aquarium. I've heard plaster of paris mentioned and they sell it locally at Canadian Tire....is this a good source or should I look for something else? I'd prefer not to have to order it online if it can be helped I'm using fleet enema for phosphates, kno3 for nitrates and potassium, and flourish for trace, was planning to get some epsom salts for magnesium , just need to find a way to do calcium Thanks!
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post #2 of 15 (permalink) Old 05-30-2011, 04:20 PM
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Well, if you're trying to be creative about it, how about a bunch of shells?
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post #3 of 15 (permalink) Old 05-30-2011, 04:25 PM Thread Starter
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well i was hoping for something I could measure, the online calculator i'm using suggests 10-30ppm of calcium. I don't have a test kit to measure calcium unfortunately.
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post #4 of 15 (permalink) Old 05-30-2011, 05:26 PM
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I'm not sure there is a safe at home supliment. I use Calsium Sulfate (CaSO4) but I purchased it online...


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post #5 of 15 (permalink) Old 05-30-2011, 05:41 PM
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Gysum is CaSO4 * 2H2O. Plaster of paris is CaSO4 * 1/2H2O. You can get food grade gysum in the Asian Grocery store. Food grade stuff is free of industrial contaminates where chemicals are processed. The art stores will sell plaster of paris as well.


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post #6 of 15 (permalink) Old 05-30-2011, 05:47 PM
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This is what is in Dap Plaster of Paris: (from the MSDS)

"SECTION 2 - COMPOSITION/INFORMATION ON INGREDIENTS |
|-------------------------------------------------------------------------|
WT/WT %
ITEM ------------ CHEMICAL NAME ------------- CAS NUMBER RANGE
---------------------------------------------------------------------------
01 Calcium Carbonate 1317-65-3 15.0-25.0 %
02 Calcium Sulfate 7778-18-9 75.0-85.0 %
03 Crystalline Silica 14808-60-7 0-1.0 % "

You will be adding to both the GH and the KH with this. The tiny amount of silica should be of no concern.

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post #7 of 15 (permalink) Old 05-30-2011, 05:55 PM Thread Starter
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so i'm safe to use this brand of plaster of paris then? any recommendations for dosing with a 55 gallon tank? my water is only 2dH, based off your information I stayed away from buffering with baking soda when introducing CO2, so far my fish seem fine
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post #8 of 15 (permalink) Old 05-30-2011, 06:00 PM
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Why not just use Seachem Equilibrium if they have that at your LFS?
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post #9 of 15 (permalink) Old 05-30-2011, 06:02 PM Thread Starter
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i figured Equilibrium wouldn't last, i'd rather something that will go further, i figured the plaster of paris would last a long time
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post #10 of 15 (permalink) Old 05-30-2011, 06:36 PM
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I think I would just add a teaspoon of plaster of paris every two weeks or so.

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post #11 of 15 (permalink) Old 05-30-2011, 06:38 PM Thread Starter
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ok, great to know Hoppy, i've been getting a lot of information from your posts, so thanks a lot for the help. I thought i'd have to dose it 3x a week like the other ferts, would you recommend only dosing magnesium (epsom salts) every couple weeks too?
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post #12 of 15 (permalink) Old 05-30-2011, 08:15 PM
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Remember, both magnesium and calcium are used as trace elements by the plants, so they are used in very small quantities. It probably takes a certain concentration in the water for the plants to get it, but I can't see how the plants would ever deplete it once it is there. I think most people add both when they do 50% water changes, and only then.

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post #13 of 15 (permalink) Old 05-31-2011, 01:39 AM Thread Starter
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i do a 50% water change every friday based off the dosing sticky it says dosing 3x a week for both macros and micros, so i assumed magnesium and calcium would be dosed just as much.
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post #14 of 15 (permalink) Old 05-31-2011, 02:16 PM
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http://www.greenleafaquariums.com/aq...m-sulfate.html


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post #15 of 15 (permalink) Old 05-31-2011, 07:05 PM Thread Starter
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I'm in Canada, they don't ship to Canada I wanted something I could get local, but thanks 150EH
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