I see what you mean now. I would have definitely put the nem in there with something like a cup, or some egg crate if possible. But I figured it would be even more stressful to pull it off the rock my force. It looks happy for now, might even be moving off the rock we will see. If so I'll slap some egg crate in there instead. Will be monitoring ammonia incase anything goes astray.
Also, wondering if all the bacteria on the rock would really die. If not, it could just be helping filter out any unwanted ammonia spikes? Idk just guessing here.