I had a silver dollar sized piece of Xenia that just wouldn't stay in place no matter how much superglue I used. I poured this epoxy onto the sides of the splinter, laid a large chunk on the bottom and pressed it into the living stone with my fingers. It hardens quickly under water, so work has to be done quickly. However, it will not stick to the flat parts of your stone. He definitely needs gaps to dive into and hold on to.
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