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Dave MN Nano

What are these black bubbles on my ACan?

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Dave MN Nano

Are they bad?

44919880-BC36-4324-9124-32DAD4B7BA99.jpeg

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PeterU

Bubble algae, pest.

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Clown79

Bubble algae. You can gently twist and pry them off to remove them

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Dave MN Nano

Thanks much. They were all on the frag plug so I took it out and easily got them off. 

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