Encouraging growth of organisms that make calcium carbonate shells for carbon capture?

So, this is something I've never heard suggested, and I'm sure there are reasons why it wouldn't work since it isn't something I have heard spoken about (I'm thinking maybe insufficient calcium in the oceans, or it being far too slow) but I'm not certain about either of these.

So, could this work? And since the answer is almost certainly no (otherwise people would be talking about it) why doesn't it work?

Sincerely a curious and slightly uneducated redditor.

submitted by /u/bluebell47
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