if you get ammonia, you should immediately google "reef tank ammonia misread" and locate your tester among those twenty thousand results and then ignore it. you didnt harm the rock. I could drain my entire reef empty from now till lunch and it wouldnt harm the rock, we have myriad examples of emersion testing already on file scattered about challenge threads. *what makes your test kits misread here is the mixing around of waste that would normally be settled and only read as .25/cyclers joke. but really its the organics you're mixing around by moving rock, its not actually free ammonia and your aquarium rock doesnt have much to die off, post pics of it for examples. its not uncured KPI aquatics rock I bet