It has only been 2 days... It would not register any Ammonia on your testkit...
Once, the ammonia spike, your fishes will be dead before you know it.. Ammonia can kill within a day... I know many will say, SO WHAT, IT IS JUST A FISH... It is irresponsible and not doing a favour to Mother Nature if you cannot give the fishes, the care and environment they require, it is better you not start this hobby... And we are not doing ourselves a favor by not being responsible to the fishes that we buy.. The wild reef is already be in a very bad stage due to overfishing so we should treasure the fishes we buy and try to give it the best environment we can...
And adding fishes without the a certain "amount" of bacteria will certainly crash your tank as the bacteria cannot handle breaking down all the excessive waste... And restarting with a crash tank is waste of money, fishes and time...