So, since the API test isn't exactly the best measuring nitrates for a couple reasons...I decided to try the salifert test. It's weird though, some sites list it as a freshwater test, and some say saltwater only. Similarly on forums and comments about it, some say they use it for freshwater all the time and like it and some say it doesn't work for freshwater.
Does anyone here have a more definitive answer on the reasons why it would or would not work?
The last couple days it's been measuring my nitrate at 10ppm and the API test is showing either 10 or 20 since the colors are exactly the same on the chart.