Could I have the fastest tank cycle ever??

[chaser]

I started my tank around 10 days ago using fully cured live rock that had only been out of the tank for about 30 minutes. After 2 days the ammonia rose to 2ppm and then dropped. My nitrites went up to about 0.5 then dropped and my Nitrates were a little over 12.5ppm then dropped and after 10 days all are at 0. so as it stands
Ammonia-0
Nitrites-0
Nitrates-0
PH-8.2
Specific grav-1.025

What do you think, I plan on waiting a few more days to a week and continue testing making sure that nothing spikes up on me, but could I be cycled that quick??? I just started running my skimmer as well yesterday, good idea bad idea?? I have heard mixed things about doing that, but its a brand new aqua c remora nano and I wanted to break it in cause I know it takes about 2 weeks to actually start pulling anything, so far just clearish yellow liquid. Oh its a 20 gallon and I have been using ro water from the grocery store. I think thats all the info I can give. Help me out let me know what anyone thinks.
Thanks a lot