Yeh most are from oyster shells
well its not to supplement the worms its to keep their medium from becoming to acidic so they add limestone to keep the ph of the substrate neutral otherwise it will kill the worms.
Although that's just from what I've read.
About the calcium carbonate though,
Here's the website that has it.
http://secure.sciencecompany.com/Cal...P6641C670.aspx
Was wondering if you think this would be ok to use?





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