Coralline algae is another example of the variety of the Phylum Rhodophyta and the red algae. Coralline algae are plants and need live rock in order to settle and grow. They are considered a vital part in every reef and marine system. The algae produce chemicals that promote herbivorous invertebrates. These in turn keep various sea weeds from growing which would otherwise smother the algae or keep them in the shade.
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