Here is the link for anyone interested in an easy and safe way to get bta off of rocks.As mentioned above, usually pointing a power head towards the foot works to get them to walk/let loose. The other option is there’s @Eagle_Steve contraption (I forget what it’s called) but it’s a sponge and tube that makes them crawl in it and gets them off the rock.
https://www.reef2reef.com/threads/safe-and-easy-diy-way-to-remove-nems.861213/
