65g reef

[0sprey]

Your rock will come alive, not to worry. It just takes a little while for the critters that have survived to multiply. With good lighting, a little food, and clean water, the rocks will surprise you with the different lifeforms that sprout. I have had my rock for almost a year, and just recently discovered a black limpet, living undetected all that time (too bad the miserable peon decided to eat my GSP... he was kinda pretty until I peeled him off the rocks). Eggs, algae spores, etc, will sprout after a long time.
I would expect the first visible signs to be bristleworms and aiptasia... but then you might start to find pods, tubeworms, and various macroalgaes, most of which are fun. If you see a choice bit of rock in the store with dusters or something else hardy you want, buy it. The lifeforms on that rock will spread through the tank.