If it were me I'd just sit tight and wait it out. Do your water tests every day to keep an eye on the ammonia and have a good size bucket of change water set aside just in case you have to do a quick change. If the rock was cured when you bought it.....it shouldn't have experienced much die off going from the store to your house if you transported it wet/damp and got it in the tank pretty quick. Of course, no telling how much may have died from the chlorine...
...I'd still sit it out and keep an eye on things rather than try to pull everything out and start over....but, that's JMO