Great, that's what I have(the gel) specifically designed for corals and it's saltwater activated. 2 small mushrooms I placed securely in small holes in the rock and they fit perfectly and are out of the current. They should secure themselves naturally. 1 tiny shroom was attached to a tiny rock which I was able to glue in place. I have 2 medium sized left and I glued them to the rock applying the glue gel directly to the feet and placed them on the rock. I know you can use superglue to apply to cuts and gashes acting like stitches so I figured it couldn't hurt applying it to a coral... Well see.. If nothing else its an experiment! Got these 5 various colors of mushrooms at LFS
today for $15. I get the ones that have been laying in the sand in the tank for large coral frags/rocks. Just random pieces that fall to the bottom and grow. If you can do this you could cover a large rock for under $40. Depending on LFS
. Sometimes they can be tight wads!