I have two questions. First off, my coralline algae look as if it is dying off. Parts of it are turning a dark brown and gray. But other parts are going strong. My set-up is about a year and a half old. Is this normal? The other question I have, is is it wise to put a different type of substrate on top of a existing substrate? Right now I have sugar sand and I want to put medium size aragonite on top of it. My sugar sand is alive.



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