Lanej20,
Looking at your posting history, I'll go out on a limb and say you should probably slow down. (Although I think that advice may come a bit late.) If I'm reading things right, you've got a 55gallon, that just finished cycling late last week? And you're planning on moving in 2 months? And you just added a trigger and tang? Wow! (Or is the trigger and tang in a separate QT... and not your main tank?)
If you have no live rock other than that 30 lbs on order that you mentioned previously, I'd get a fair amount of saltwater made up in case you need to do some major water changes. Adding a couple moderately sized fish this quick will probably tax your biological filter and cause an ammonia spike. Just be prepared to do water changes to keep the ammonia levels down as much as possible.
The comment about changing 50-75% of the water was to get the nitrates down to as low as of a level as you could... before introducing any fish! Changing out massive amounts of water without fish takes a lot of stress out of the whole process because you don't have to worry about shocking any inhabitants with different water parameters suddenly (pH, salinity, temperature). Additionally, you want those nitrates down as low as possible in the very beginning just to make as good of a start as possible. However... changing out 50% of the water with fish in the tank is still totally doable - just make sure the water parameters of the incoming water match that of your tank.
Keep testing for ammonia daily.