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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.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]