I have been having this problem with my tank. 0 nitrites, 30 nitrates, but my ammonia goes back and forth from 0 to a reading somewhere in between 0 and .25 using aquarium Pharmeceuticals. I just did a PWC, cleaned my gravel and did a PWC 2 nights ago. When I tested my ammonia it was higher then before I started. I tested my tap water and it tested 1 for ammonia, is this bad or normal? How can I get rid of the ammonia when every time I do a PWC I'm adding it to my tank? I use Prime which removes .60 ammonia , I wonder if that's why I kept getting the readings. I'm a little worried about myself too considering I drink it all the time. Thanks Leah