Originally posted by mudplayerx
I figure why spend $45 on test kits just for a cycle when your numbers are going to be going crazy anyways, when you can just be patient and wait 40 days.
I agree with you on patience but this has little to do with patience in this context. This is following a set pattern of levels of ammonia, nitrite, and nitrate to follow how well the tank is cycling...whether it has done so at all, whether it is stalled (which can happen if pH is out of range, for example), or whatever. When we talk about patience, it is going out and throwing a bunch of fish in, it is rarely about following water chems to determine if it is OK and how things are progressing. The former is impatience...and a risky behavior, the latter is being fully involved in the tank.
IMO, you don't have to test, but I wouldn't be real comfortable.
Levels can be 0 after a month because you cycled hard, or because you barely cycled at all. One will be fine for fish, the other will be too late to start testing.
So, while patience is a key in this hobby, especially when it comes to stocking of fish and invertebrates, knowing the history of your tank - how it cycled, what the chems are, etc is equally important. I don't think patience and water testing during a cycle are at odds...I think not knowing what is going on is potentially riskier actually.