old dead live rock

[sakai712]

hi, my friend gave me some dead live rocks thats been sitting in his backyard for about a yr. can i still used that in my reef tank, and what would i have to do to it b4 i put it in.? do i have to soak it in hot water or something? cuz it has spider web on it and stuff. And will it become live again after its been in my tank for a while? Theres like 50lbs of it, it used to be in his 90g fowler tank.