[Van down by the river]

Why not add live rock that has been in a LFS for awhile?
It has already cured in their tanks and will produce far more animals and diversity than bleached or dead rock. Just watch your ammonia if you have problems you can reduce them with water changes. I suggest not to add too much at a time. You can clean off any questionable organisms off the rock in a bucket of saltwater before adding it to your tank.