So I have been noticing my nitrates rising quickly even after the large frequent water changes I do. So I tested my tap water and its at 20-30 ppm straight out of the tap!!! No wonder my nitrates are getting up to 40ppm!! So what do I do? I do 25 percent changes every monday wednesday friday which is 32 gallons every time!! I can't buy that much distilled water!! What do I do!!!???