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hello, I was informed by someone on here to do a water change of 50% on my 55 gallon fish tank because the peramiters of ammonia and nitrites and nitrates were up a bit. I did that last night of 50% not gravel vacuuming and come home today after work to test it again and they still seem to be up a little but the nitrite went up a little bit. Should I let it run a couple days or do a water change and gravel vac again or what?