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-   -   Calcium carbonate (http://www.aquariumadvice.com/forums/f11/calcium-carbonate-125973.html)

divedeep1689 02-04-2010 11:50 AM

Calcium carbonate
 
Hey guys i was watching a video on The great barrier reef, They mentioned in the video of the calcium carbonate for corals, Then they mentioned that they calcium carbonate they use is the same exact thing classroom chalk is made of. I searched the internet looking for articles that may contain information on using this in a reef tank, i found one college student who had experimented with it after researching but it never mentioned the results of his experiment.

melosu58 02-04-2010 12:28 PM

I`ve never heard that but I`d be interested from others if they have.

ccCapt 02-04-2010 12:48 PM

Hard corals don't "use" calcium carbonate, it's what they are made of. They extract calcium chloride, sodium carbonate, magnesium, etc from the water and excrete it as calcium carbonate...which is their hard skeleton.

Chalk is mostly calcium carbonate with some silt, clay and silica. It has no use in a reef tank. Calcium carbonate will not dissolve is saltwater unless the pH is around 7. It would dissolve in a calcium reactor, but it probably has too many impurities to be safe to use.

divedeep1689 02-04-2010 01:10 PM

well thats interesting.

cmor1701d 02-05-2010 10:16 AM

Once again Larry is a fountain of knowledge.

catmel 02-07-2010 12:48 PM

Interesting. I would have never thought about that. You certainly dont want extra silica in your aquarium.

cmor1701d 02-07-2010 05:13 PM

Quote:

Originally Posted by catmel (Post 1073363)
Interesting. I would have never thought about that. You certainly dont want extra silica in your aquarium.

Why not? Silica sand is just fine for an aquarium. It's not as good as the rounder, smoother edege aragonite, but it works.

Silica SAND article by Rob Toonen

catmel 02-07-2010 05:41 PM

I was under the impression silica can lead to diatoms?

divedeep1689 02-08-2010 12:51 AM

Quote:

Originally Posted by catmel (Post 1073455)
I was under the impression silica can lead to diatoms?


I was too.


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