Ricordia can't be glued on, they have to coaxed to stay in place. First put them in a tray in your tank with rubble in the bottom and wait a week or so until they attach to the rubble, then the rubble can be glued onto the rock. Why not give the plug a more natural shape and lightly glue it to your rock. You can remove the plug when the Ric moves off.
Rob
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