My science teacher is really wanting this river to be nice and heathy so I told her that and showed her a picture of the fish. I orderd a amonnia tast kit from the link http://www.petsolutions.com/Default.aspx?CategoryID=46 just scrolldown and click on "last" and you should see a product that is titled "LiveAmmonia Test Meter" I also got the "LivepH Test Meter". They are kept in the tank to constantly measure the NH3 and pH levels. Also does anybody know what the pH should be at for my darter. I hope my test kits get here soon.Wild darters are often used a water quality indicaters during stream studys because they a very sensitive to pollution. With that said, of the darters, Johny Darters are the most hardy. Thet are a stream fish so be sure to have good water flow in your tank. When I had Ichthyology a number of my class mates kept darters we caught in class, and I balieve the Johnys faired the best.