what is this white stuff?

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#7
I will try, but it really is just white material on edges of rocks. Never seen this before.Does not look like animal or plant.
 
Joined
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#9
I've been noticing the same in my tank at an end that gets lots of natural light. I did a search and come up with bleaching or dying coraline. Nothing else in tank having problems. How about yours?
 

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