08-12-2011, 12:35 PM
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That's nothing to worry about. I have stuff like that from the filter periodically, usually after i clean/rinse the media, since I seldom flush the hoses out, and this stuff forms along the hose and sudden water flow can loosen it. Sometimes even switching the filter on after the water change dislodges a bit. At least, that is what the stuff in the photo appears to be.