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It is possible that your rock was pretty cured as you stated. If that was the case, that explains the mini-cycle with ammonia bumping up. Being that you have such a small bio-load in there now, including so little rock, you may not be seeing anything because your cycle was so small.
This is important to keep in mind moving forward. Stock needs to be added very slowly so that the small cycle you started can grow to handle the increased bio-load.
Adding stock too fast (including live rock) can cause another cycle that will endanger your fish.