Devils hand finger leather is barely attached

[Saltysteve]

Uh Oh, been enjoying looking after a small 3/4 inch devils hand finger leather for the past month. It is now about 1.5 inches tall, twice as fat but, he's quickly becoming unattached from the rock. Troubles when fragged lead to the use of a net to keep him attached but now he has grown through the netting and he's not re-attaching again Grrrr.......
Any ideas to get him to attach?
can I tooth pick him in the tank? My guess is no due to leaching.
Thanx