sounds like the rock is safe just dead, when you get the tank started up again i would just add a few new peices of 'live rock' to re-seed your old rock, it will take some time but will become live again once the organisms reproduce and spread, i would just stay away from any fish that need live pods etc to survive until you are sure you have a decent population again, as i would expect it to take several months, depending on how much rock you have.
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