Any idea what the gray dust like stuff is?

booth2010

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Noticed this in my sump a few weeks back, it's gotten worse. My only guess is dust or detritus but I wouldn't think it would gather like that in the fuge section only.

ImageUploadedByREEF2REEF1398699414.133014.jpg


It's on the rocks in fuge as well

ImageUploadedByREEF2REEF1398699452.114660.jpg
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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