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Hi, nitrites this should say! Predictive texting ! They 2 large Oscar’s in a 600l tank with only 2 plants in there. I have had these fish for months and this happened before the water change. After the water change I added gravel and 2 plants to soak th This is a 600l tank. There is 2 Oscar’s...

Yes I have changed all filters and done a full water change. Have checked water and nitrates just under 1

My Oscar fish are all lying at the bottom of the tank and they have went pale. I have done a water change and test is showing 1 in nitrites which I don’t understand as just cleaned the full tank out . Please help me