live rock ?

Your going to have to recycle the rock. I wouldnt recommend doing it in your tank because the dead bacteria might cause a spike of trates/phos in your tank
 
I bleached and acid washed all the rocks I put in my 120 that's cycling now. Why did you let it die or get dry?
 
I moved and didn't save the water and didn't want to haul the weight and it was full of little white stars. I'll Prince the loose stuff off and start cycling.
 
I bleached and acid washed all the rocks I put in my 120 that's cycling now.

this is what I would do. If you don't want to do this I would soak it in ro/di and check phosphates. If phosphates start showing up I would use that pool chemical people are using to remove them from the rock.
 
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