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I second the cyano! The bubbles are the clincher. Blow it off with a powerhead as much as possible. It can overwhelm and smother the coral and it also can poison it, so, act quickly to eliminate it. I've noticed that the cyano will grow on new surfaces (rock, equiptment, so on)and also will attack weakened and diseased corals.
 

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Uh... I think that Johnny is trying to identify the fuzzy red 'macroalgae' that's growing out of his rock... :D
That isn't a coral covered in algae... it's the actual algae structure. :)
It sure looks bizarre to me...
I would really hope that that isn't a huge cyanobacteria colony. :funny:
 

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Are you sure? I had a halimeda that became covered that looked identical to that-lost the halimeda btw. I guess Johnny will have to set us straight on what it isn't.
 
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