The rock may very well be alive still - Live rock is labeled as such because of the denitrifying bacteria that has populated is surfaces. What copper kills is the rest of the stuff - Coraline, algae, tube worms, crustaceans, and other inverts which are just a bonus when thinking about the value of limerick. I'm not sure if this will give the ICH, Velvet, Flukes, others an edge who trying to survive - I wouldn't think so as the copper is in the water column and can reach them anywhere in the rock - but I do think its smart in managing the ammonia issues that most quarantine setups face because of a lack of bio filtration. Should make keeping the thee copper concentration accurate by reducing the number of water changes needed. I would be interested to hear more on results - good luck!
