This debate could go on for 100 pages...
Vetteguy is right. and yet he is not right.. Confused yet? Heh welcome to aquaria..
Vetteguy is advising a well established, and successful platform for success. It has been done, repeatedly by an overwhelming majority of aquarium owners and it works.
I have been keeping aquariums (mostly freshwater, but I did have a fish only salt tank for a few years long ago) for over 30 years. My personal experience has been: As long as you introduce hardy species first, and add slowly, you can add fish to the tank from day one. Bottled bacta, such as Dr. Tim's, as you mentioned, will provide the base network of the ammonia nitrifying bacterial colonies you need to sustain life in your tank.
Wait a month before adding any "clean up crew" to your tank.. It is brand new, what do they have to clean? Would you bring in a maid to scour your brand new home?
In a tank as small as yours, I would advise that after it has stabilized from the initial setup, you add livestock slowly, no more that 2 fish or corrals at a time. Keep a close eye on your parameters after each addition until you reach your final goal.
Good luck,
Steve