Pink white colored patch

Ruturaj

Goliath Tigerfish
MFK Member
Aug 6, 2011
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Seattle, WA
It's probably scrapping on the inside of the rim. Maybe try lowering the water level?

What's the nitrate level at?
Didn't test it, it has been below or around 5 last few times. Have to test it in evening. Shouldn't be high though.
 
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