Okay so I started a 55g tank. Yesterday morning the ammonia levels were high and I started using Microbe-lift xtreme and did around 25% water change. I kept using the water conditioner during the day. Today I checked the water and to my surprise there is 0 ammonia and 0 nitrates, but the Ph went down, its between 7.4 and 7.8. They seem to be breathing a little fast. is it possible to have 0 nitrates? Im stressing out.