coraline algae question

surferido

funky buttlovin
while i was staring at my tank i noticed that Coraline algae is starting to grow on my live rocks. i know its good but my questions are: what does it do? and does it mean i have a healthy tank? thanks
 
It is a sign of a healthy tank, as far as I know, and +1 daugherty. It will deplete the system of calcium, however, and if you have corals you may want to look into supplementation.
 
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