Originally Posted by Wings4wheels
Will I need some "seed rock," or will the rock still be alive?
The rock is now dead. You can get a few smaller pieces of "live rock" if you want but honestly its not needed. Use the rock you have and save yourself money. The "dead"rock will become "live" again and growing all sorts of bacteria on it an you'll get to watch the rocks change all sorts of colors.
The upside is no pest hitchhikers. What you see is what you get! It's a good route to go IMO
Your good to go.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley