Spots in rocks

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ndz98

ndz98

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What are these spots on my rocks?

image.jpeg
 
www.dinkinsaquaticgardens.com
Is it hard to remove from the rock? If so, then Coralline algae is definitely a possibility.
 
cloak said:
Is it hard to remove from the rock? If so, then Coralline algae is definitely a possibility.
Click to expand...
Yes. I have to scratch it off pretty hard.
 

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