Did you use live rock from an established tank?
If you did then you wont get a cycle.
If not, was there much stuff that died off to create some ammonia for you?
What I would do in either situation is throw in a small chunk of shrimp into the tank and let it rot, creating ammonia. If you tank is cycled, then it will break down the ammonia without a spike. If it is not cycled, then this will kick off cycling the tank. Either way you know what is happening.
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