Should I Take These Rocks Out?

ASHLEY R COOK

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Is this rust? I'm not sure what kind of rocks. They were at Petsmart and are a top fin brand. Should I return them?
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Edit: I realize I posted this is the water forum. Wrong section.
 

Fanatic

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I have these exact rocks, and it is not rust.
They have been used in my tanks for a while, and I have seen this come and go from them.

Does it rub off?
 
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ASHLEY R COOK

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Fanatic said:
I have these exact rocks, and it is not rust.
They have been used in my tanks for a while, and I have seen this come and go from them.

Does it rub off?
I haven't tried.
 

johnbetta

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there is a few kinds of algae green brown hair algae and black spot algae just to name a few lots of people dont know much about algae and the diffrent types
 
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