I have had to move one of mine like 8 times! I am now the Nem whisperer
I use super chilled RO/DI in Julians thing..or u can use a small pipette..spray edge of foot till you can wegde the tip under and keep spraying it...it will detach and then when you have enough clearance ..just literally rub the foot upwards.. away from the rock. Don't force it, but be firm. It will take a few minutes, but it slowly detaches as you keep "Petting" it ( that's what my kid calls it lol). That way I never risk scratching up the foot. Good luck