Adding more live rock to established system

[04scoobysti]

i just doubled up my rock when i moved from a 10g to a 20g, i also doubled up my live sand too. No ill effects on the tank inhabitants (corals and fish), just a little bit of a cyano outbreak. So i think you'll be fine with adding cured rock and doing it all at once. You may not even suffer any noticable effects, i had way more variables that could have caused my outbreak.