Originally Posted by
ophiura
http:///forum/post/3079103
I wouldn't say it "does" anything for the tank, however growth of it is considered to be indicative of a reasonably well balanced system. It is an indicator more than anything else. Tanks can be successful without it, though an SPS tank could have issues.
Yep, in addition, coralline algae produce chemicals that promote herbivorous invertebrates. These in turn keep undesirable algae from growing which would otherwise "smother" the algae, slowing its growth.
Also I think I can remember learning that corallines produce a form of magnesium that is beneficial for reef invertebrates...
. Correct me if I'm wrong on that one though.. been a while since I've opened that text book