hitchhiker ID help

[fishface]

not sure what i'm seeing in my tank but it sounds kinda crazy i know. i'm seeing a small disk that almost looks like a paint chip with curled edges about the size of the end of a pencil eraser. didn't think too much of it before but last night i saw about a 3/4" long extension coming outta it blowing around in the current...

anyone have any idea what this might be??

darryl