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I pick mine up for free on bars out in the bay. They are already crushed into fairly fine pieces and dried out in the sun when I pick them up.
I haven't tried the plastic shavings, but I've heard of people trying them and they really didn't increase the speed that the coralline grew. I have found that if you sacrifice a couple of small live rocks that are already covered in coralline and crush them, then you can take what's left and pour it on top of your homemade ones. This will seed them and your coralline should take off considering all the tank conditions are correct.
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