Bugs?!?!

so my babies are flowering and looking great but today i noticed some salt like specks on some of the fan leaf stems. when i touch it its almost like a rock but then it crumbles when i squeeze it, heres a pic, i dont see any bugs on the leaves or anywhere else in the plants. i dont think its mites but dunno ...... i threw in a pic of my tape trap, not to many gnats on it for a months time. the speck on the stem of the fan leaf is what im talkin about. again not a bug of any kind just a rock
 

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