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https://www.rollitup.org/t/dwc-root-slime-cure-aka-how-to-breed-beneficial-microbes.361430/ Heisenberg explains it all in the first post

the slime isnt algae its actually a cyanobacteria, but commonly referred to as brown algae, etc.

Ewc tea

Something in your nutrient line contains beneficial bacteria and it's the bacteria causing the foam. My guess

Check the trichomes with a 30x microscope... only way to tell if it’s ready