Bro, trap yr pbt and put in a 2 compartment betta box and let them see each other. After lessen agression, release yr clown and 1 or 2 days later, release yr pbt. Make sure yr clown pass thr the stress stage. If yt clown is bigger and eating Luke pig, she shld pull thr. Other method is mirror. U can also try putting them into a Pail and do minor rock scape and later put in. Clown tang is not "fan fan zi bei", they used to whack my 2 big sohals. . All the best.