Your tank don't look half bad. Take a Turkey baster and blow the diatoms off your live rock and do a 30% water change and you should be good to go. By that I mean to add your CUC and then a week later add one fish, If you have a "large tank, 125 or larger" you can add more fish, like two or three.
PS: don't forget to test your water as that is the only way to truely know if your tank is ready. Remember that your LFS
wants to sell you as much fish as they can, not what is good for your tank...Go slow and you should be okay.