What is a good kit for testing the water for ammonia, nitrites, and other things? I'm kind of frustrated with the one I have right now. I have a hard time comparing the colors for the different ranges because the shades of color all seem too similar. Is this how all the kits work and I just need to learn how to compare the colors better?
While I'm talking about more things that I need to buy, what are some good medicines to always keep on hand?