Reef Junky150
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Not sure what it is but the astreas love it and have been slowly getting rid of it. Any ideas?
Weird dark purple on rocks, any idea?
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ScottMyers123
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It looks like coralline algae. Asteria stars love it.
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Reef Junky150
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Sorry uploaded wrong second picture.
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That's cyano if it's the stuff on the rocks in the back.
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Reef Junky150
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Really? That's crazy. I've never seen it so dark in my years. Need to figure out why it suddenly appeared. Luckily the astreas I just added are going after it so I don't suspect it to get worse. They are slowly but surely eliminating it.
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Reef Junky150
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Trochus have been helping as well.
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