A good way to check, IMO
, is to take a nice size chunk of uncooked raw shrimp and toss it in the tank until you read nice amonia reading. I take a NEW nylon and cut the foot out and put the shrimp in there just to keep it from making a mess. Once you see the ammonia spike from the decaying shrimp take it out and over the next few hours test for nitrites only (easiest test in the API kit) if you arent seeing any TRITES above your base readings and the Ammonia is staying pretty high or not going down at all then no you have not cycled yet.
Again this is what I do to test for a cycle, basicly cause a mini cycle and see how quickly it recovers, only do this on a new tank with out fish.