What is this? Algae in WC buckets?

#22
So I'm late to the party here but does it matter if the brown slime is in the bucket when you do a water change? I have RO water I put in the white food grade buckets plain, I clean and dry before hand and they are spotless and hold water for weeks without any slime. When I use that same water/bucket for a WC, add salt, pump, airstone, heater and a little of my water from my tank, voila.. brown slime. I used to go crazy until I reviewed my tank logs.... every time I had brown slime, I never got a diatom bloom or anything but an awesome clear tank after. Is the brown slime good? Can it be eating the bad stuff (food/fuel) before it gets in the tank?
 
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