What is all over my rocks? I have had it for quite a while and not sure what it is.

[acso151]

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[makers marc]

If its hard to scrub off, some bacterial buildup from overdosing carbon or something.

 

[Subsea]

Looks like Star Trek to me.

 

[acso151]

If its hard to scrub off, some bacterial buildup from overdosing carbon or something.

I don't dose carbon but will see if it scrubs off easy.


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