They go where they want. Even if you coax it out it's gonna take off and find a comfy spot. The best thing I found to make mine move is turning a powerhead towards them. Not so they are flapping in the breeze...but enough to shake it up a bit..lol. Even after making it move, it just went to the other side of the rock and now I can barely see it at all. I'll see if I can dig up pics of my new nems opened up
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