I think it would be better if you use epoxy to create a base for soft corals like button, musrhooms, ricodeas, xenia etc then use super glue gel to bond it to your main rock.
Need to borrow your pics Thio hope you dont mind. Anyone what is the name of this crab or lobster? Or any information.
Hope it is reef safe. But seem like a plankton feeder.
Thanks in advance..