Just in case you meant that...
What is LACKING from a new tank is good bacteria, be it in the substrate, on the glass or in the filters.
There are no issues with bad bacteria per se because a new tank will be more or less sterile.
To get the good bacteria going, add Mulm to the substrate & filters (if you can - the best kick start and will greatly reduce the cycle time) and then get them growing by adding pure ammonia on a daily basis.
Regualar testing from then on will tell you if your tank has cycled and you can add fish, a process that will take longer than 2 weeks.
If you knew all that then apologies....
Andy
Sorry Underwurlde, yes i did know that but did write it quite right. I meant that in 2 weeks without helping things a little there wouldnt be enought GOOD bateria for the fish. Think i got it that time, this cold is really messing my head up
