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  1. hollyfish2000

    Why am I getting nitrite spikes after a water change?

    This happened again this weekend. I have a 30-gallon, set up for two months, with two established filters, lightly stocked and lightly fed. I test every morning for nitrite and it's zero. I did a water change this weekend, about 25 percent. I added more than enough Prime. I did not shut off any...
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