I've had my neon tetras nearly 4 weeks now and nothing is happening in the tank! I have a 64ltr tank with 10 neon tetras, they get fed once a day. My ammonia nitrite and nitrate have all been 0. Two days ago my ammonia might have been 0.25 but it's hard to tell with the colour chart (API master test kit)I have done the tests to the letter. I have done 3 water changes in 3 weeks of about 5 to 8ltrs each time and now and again sucked the waste off the bottom of the tank with a turkey baster! I use love fish tap safe and put filter booster in when I do a water change. Am I doing something wrong? The fish all seem happy but don't want to add more fish until the tank has cycled