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Old 07-08-2011, 05:29 PM   #1
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Hi I've had an aquarium going healthy for awhile but i have a problem my ph is always stayed at 7.4 and ammonia nitrites were 0 and nitrate was around 5-10 and now ammonia is between 0 and .25 ppm and nitrite is 0 and nitrate is inbetween 5- 10 still is this ammonia level dangerous would do I do thanks and yes the tank is cycled

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Old 07-08-2011, 05:38 PM   #2
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Have you made any changes recently like switching filter media, adding new fish, heavy cleaning, etc...?

If so, it could be a mini-cycle as the beneficial bacteria adjusts to the change.

.25 is the threshold of what is considered safe(ish) for your fish. I'd do daily water changes for a while and monitor the levels. If it is a mini-cycle, it shouldn't take long to straighten out.

What type of test kit are you using? If it's API, it's notoriously difficult to tell the difference between 0-.25. It's possible the level I'd actually zero and all is well. try testing bottled water as a control and see if the color matches what is in the tank.
The (almost) Complete Guide and FAQ to Fishless Cycling
Being responsible...fishless cycling defines it, fish-in requires it. Choose wisely.
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