Quote Originally Posted by kimbosaur View Post
To be honest with you, with guppies, I don't bother with testing. I just play it by ear by observing the fish.

It obviously is better to though. You would have to test for ammonia, nitrites, nitrates, in that order. In the beginning, there's no point in testing for nitrites or nitrates, just ammonia. Once your ammonia reaches 0, then you can start looking out for the other two.
Ok thank you! =] And how to I do that? What do I look for? I really have no clue :/