I put the rock he is on to the bottom of the tank, low light and low current next to the wall. As he is about to climb the wall, when his foot still inflate, I remove him. It also really easy to remove aneone on glass, just take a little patient and a credit card. I also situate it near a smaller rock (or a coffee mug) with better condition for him, once he climb on the small rock (or mug) I take the rock or mug to where ever I want him to go.