I think most of the problem with the Caulerpa family is the worry that it might go asexual and release its gametes into the water, decreasing your water quality and perhaps affecting some livestock, not to mention the excess nutrients that will fuel other types of algae.
As well Anthony Calfo has talked about Caulerpa pruning methods and that the "sap" released into the water upon pruning can cause an adverse effect and possibly trigger an asexual spawn. Its somewhere on
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Christy
