Not to say your sources of information are wrong, but....they are wrong.
Acropora are voracious feeders and ingest more per mass than large polyped corals, in general, and among those studied. But, they feed on animal material (zooplankton), particulates, bacteria, and, of course, dissolved nutrients. They do not, insofar as has been found, feed appreciably if at all, on phytoplantkon. In fact, insofar as is known, very few corals feed on phytoplankton at all.
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Eric Borneman
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