Yes it will have dead stuff all over it and create a mini cycle as all the dead material acts just like a fish dieing. It will need to be cured, put it ina bucket wityh water and circulation of some kind. do water changes every week or so untill it goes thorugh the cycyle and the water starts to test correct, no ammonia will be your first clue. Be warned it will most likely stink pretty bad while doing this. Also if you ahve a skimmer you can drop into the bucket with it it will speed the process up a bit. Do a search on cureing live rock and you should find all kinds of info. Another mehtod I use is to drop the rock into a bucket with a good amount of bleach mixed into some fresh water.. After a week or two of soaking I dump the water, let the rock dry then resoak it for a week in freshw2ater with amquel or some other chlorine remover. Then rinse and put it in the tank, you will have completely base rock at that point, but if the stuff has been dry for a month you most likely already have base rock now so you wont loos any life.
