how high was your ammonia reading during cycle...
The power of your bio filter will dictate how many fish or inverts you can add at one time.
Some here claim that an ammonia reading over 0.25 is to high if you have live rock in the tank, as it will kill of the live bacteria on the rock. but if you cycle with pure ammonia and only add live rock after the cycle, then your bio filter will be strong and you can add a tank full of fish and inverts and not worry about an ammonia spike.
Anyways...as the last poster said, how big is your tank, and how it it cycled.
what are it current water readings.