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Old 03-10-2019, 09:39 AM   #1
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Nitrates HIGH

Did 10% water change yesterday on 210 . Today,I did water check everything is fine except Nitrates are at 80. Unbelievable. Water check a week and a half ago nitrates were at 5. phosphates at .25. I've tried everything to lower NO3 but what is causing this drastic increase?
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Old 03-10-2019, 09:44 AM   #2
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overstocking, overfeeding, reduced skimming, something died and is decomposing is just a few things that come to mind.
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Old 03-10-2019, 11:01 AM   #3
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Do more frequent water changes and a larger percentage until you find the sweet spot

Once a week and 33%?
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Old 03-10-2019, 01:07 PM   #4
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Hello, you may want to check your filter. Food & waste build up & it will become a nitrate factory if not properly maintained. You probably know this but use tank or treated water to clean & be careful about over cleaning bio media don't want to cause ammonia spike or mini cycle! Hope this helps!
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Old 03-11-2019, 09:43 AM   #5
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I checked filters,skimmer, nothing died,not overpopulated, feeding quantity is correct. The only thing I didn't check was the expiration date on the api nitrate bottle. expired two months ago. Took water sample to local aquaria the tested (with api) and it came out 0. I made them do it 3 times..still 0. Always something.......
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Old 03-15-2019, 11:15 AM   #6
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Also check your source water. Make a batch of SW and check that out. You might be adding it to your tank esp. if you use tap water.
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