Pull the pot out of the water and turn it upside down, letting him hang above the water surface. Let his own weight slowly pull himself off as to not tear his "foot". You can slowly message his foot and help him, but be very gentle. Being out of the water will make him want to move and it can take a few minutes, just be patient. He will come off. If this doesnt work I'd just crack the pot and take the peice with him on it and place it back in the tank. Hope this helps.