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[APD] Is this caused by anaerobic bacteria?

Hello all,
I think this black stuff is the product of anaerobic bacterial action. Can anyone confirm my hunch?
Pic is here, but there is a UQ front page that you have to click the "proceed" button to get through to the pic!


BTW - is this a sign of poor substrate health? Will the anaerobic products be detrimental to the plant roots or in any other way?

- Seweryn

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