How can you remove a BTA from live rock?

[BlueTang<3]

try hanging it upside down if you can remove the rock i have about a 16 inch rose bubble tip or larger he loves flow right in front of the mp40 on high would not let go removed him and placed in a tub set upside down about an hour he let go i have also used finger to peel it off but very sensitive to there sting and my girlfriend wont touch it as she thinks its nasty