I can't remember how much biomedia an aquaclear 70 holds in the back. That's sufficient filtration overall though.
At 2 weeks along your tank is definitely not fully cycled. I can guarantee you there are still nitrites. I'm actually surprised your ammonia is all gone already and you have nitrates. I kind of wonder if that bio stuff you used didn't actually work some (did you add any old biomedia when setting up the tank, like gravel, decorations, filter media?).
Cycling usually takes about a month to a month and a half. So your cycle is going pretty well considering your tank hasn't been set up that long.