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Old 06-12-2017, 01:46 PM   #1
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Nitrite spike after water change

I did my water change yesterday like always, just at night and not in the morning. I didn't touch the filters (2) only replaced the filter floss. This morning I noticed my discus dark, not moving, breathing at the surface. I added some safe, as I didn't have time to address much else.

I went home for lunch, did a water test and Nitrites were about 1ppm, I did a 40% water change, then another doubled the does of safe and left.

What would of caused my cycle to crash?

75 gallon planted
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Old 06-14-2017, 01:12 AM   #2
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Curious, how old is the tank? I have a 6 mo old tank that just finished its cycle.

Did you do 100% filter floss change?
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Old 06-14-2017, 01:17 AM   #3
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Also, what kind of filtration?
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Old 06-14-2017, 05:37 AM   #4
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2 years or so.

I run two filters, aquatop 500 and an AC70. I changed the floss in the AC and didn't even touch the Aquatop. Normal weekly routine
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