I am doing my first fish-in cycle. I've finally seen a reading for Nitrate today. It is not significant – the water is just slightly pinkish when I test it. It's less than the smallest number on the colour chart. I also have small readings for Ammonia and Nitrite. Should I change the water now? Or should I wait a day or two? I'm not sure if, now with the appearance of Nitrate, the Ammonia and Nitrite will "go away" on their own or if I should keep doing water changes until I get a zero reading. I did my last 50% water change 6 days ago. My betta is in a 10 gallon tank.