Reddish Brown from reactor and skimmer

[eddiev0008]

Wondering if anyone know what the issue maybe? My sump reactor which has GFO and skimmer is producing a red/brownish color any suggestions what this maybe ?

 

 

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[AlanM]

my first guess would be that the GFO has fine particles and is escaping the reactor and getting pulled out into the skimmate.

 

Second guess (less likely) would be that the GFO has reduced your nutrients enough that now the only micro-fauna that can survive is dinoflagellates and that's what the orange/brown color filling your skimmate is, but I doubt that is the answer because you can see the same color in your reactor.  Do you see any signs of brown slime during the bright part of the photo period?

[ranger]

My etss downdraft has that color as long as i dose vinager/sugar

Dark brown if i dont.