Epoxy?

I would not glue them directly, the super glue or epoxy will burn their skin. I sit mine in a tray with some substrate for a month or so and let them attach to the rubble, then I use super glue gel to attach the substrate/rubble to the rock.
If you have already let them attach to some substrate/rubble, anything other than sand, then use SG gel.
Good luck!
 
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