Brown gunk on root mass

Started giving my plants a tea formula i picked up at the shop, heard many people say that adding beneficial microbial to your dwc system helps promote positive root growth, and clear slime problems, which it did. But shortly after giving them the formula i started to see this dark brown matter form around the roots. Is this something i should be concerned about and stop giving them this tea asap? or should i let it take its coarse possibly the bacteria will eat away at this.. which i hope and allow it to continue. Any input would help.

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I woud clean and change res, run some H202, fresh nutes, plenty of superthrive and fuck that tea shit off.

ASAP wash your roots and make not dirty nuts with corrected ph and ppm so ....

and insulate your res