White spots?

I have little white spots on my coraline algae, does this mean that it is dying? What should I do to help it? Everything else in the tank is thriving, so Im not sure what to do about it.
 
Oh yeah, and for anyone who remembers me from so long ago when I used to post here... my nitrates finally went down (after two fish: jawfish and purple flame fish, died) and the coral that I THOUGHT was dead is now all coming back to life! Just wanted to share my good news :)
 
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