All of your invertebrates on the rock probably died. The beneficial bacteria on/in your rock is probably fine, so the rock will still work as a filter. If you want any "critters" on your rock, you will need to re-establish the rock by adding some new live rock and allow the sponges, plants, corals, etc to migrate to your existing rock.
Keep an eye on your ammonia, as the now dead inverts may foul your water quality.