From what i checked. The only method seem to be remove infected head . The remaining dip in coral rx. Then put back. Most of the time. Peopke throw away the whole piece to prevent from spreading. I witness it. It spread in a week. From 1 head become 3 head dead. N spread to another torch. I would advise bro who buying coral to check throughly, especially when u lifted up the coral n it retracted. U can see clearly any dying or dead heads.