F#@!* Whats that smell..

[Werbo]

When storing live rock for a future project I'd try and keep the rock stable at 78-80 degrees. For this rock that has gone foul do some large water changes, let it re-cure and do monthly water changes.

Others on the board please chime in if this is a good idea...
If you want to re-populate bacteria use one of the commercial bacteria products like zeobac, BrightWell Aquatics Microbacter 7, Probio, ect after the rock has recured.