Brown slime or gfo issue?

LAreefguy

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#1
I opened my sump and it has a bunch of rusty looking stuff everywhere. Do yall think its brown slime or is it possibly an issue with my gfo reactor? Heres a shot of what my filter socks look like. Thanks!!



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sklywag

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#4
Simply put because I'm a simpleton. Oxidation is when things go bad. But there are different levels of bad. Like that screw that use to be shiny and silver but now is dull and a little rough to brown and crusty. Or that Apple or Pear that is cut in half and allowed to sit on the counter for a short while and it goes from being nice and white to brown in color.
GFO, O = oxide.
 
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