kyle that is how ive done it once, i had a 15 gallon tank that i had a buncha rubble curing in and once the tank was stable i dropped a buncha mushrooms and zoos down in there, they attached in a week to two weeks.... but for my tree sponge, it had a tiny slither of rock at the base, i glued it to a bigger more stable chunk of rock and ruubber banded it like mentioned up top, to give the glue time to take its hold, now its rock solid. good luck