Majano wand then you dont have to take the rockwork apart. They work fine just make sure to poke it in the hole a little and dont hit the button until you are right on the little pest.
Lemon juice worked for me. It looks like it’s all by itself so should be easy to treat. Put a bit of lemon juice in a pipette and inject directly into its mouth. I swear it works. You don’t want to move the rock too much. These guys multiply like crazy if let them.