mr_X
Aquarium Advice Addict
I encourage leaving some of the live tissue on the dead part. This will not hurt a coral. It's called "fragging". Everyone's doing it with no Ill effects.when I cut my frag I had to chip away part of the coral that's alive. I imagine that the OP is going to do the same because you can never be precise enough to just cut away the dead part and make the remaining coral intact