Strange black pellets

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hrolsons

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What are these black pellets that have appeared in my reef tank?
IMG_0502.jpeg
 
What is the black box thing in the picture? carbon filter maybe and the carbon came out?
 
It looks like carbon pellets to me.

Do you have carbon in a media bag where the carbon is smaller than the holes in the bag? I bought BRS's ROX 0.8 carbon, and it's so small that I've been putting it in a nylon and tying it off because it's too small for the mesh bag I had been keeping media in before that.
 

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