Help!! Advice? Fragging a leather

My first coral I bought was a colt leather off of here almost 4 years ago. It is in its 3rd tank. I have never fragged anything before. This thing is huge and is shadowing/overgrowning into some zoas, stylo and a encrusting branching unknown coral. Before in my old 2 tanks I had to cut/rip this leather off it’s rock and it would ooze out some “leather blood” or something where the tissue was punctured or ripped. So I’m afraid if I trim this thing down with some scissors or razor and this “blood” or whatever it is will affect the corals next to it. From everything I’ve researched it basically says if I run carbon, any toxins will be taken care of. I guess I’m just scared to actually cut it while it’s the display since I’ve never fragged/trimmed before. I can not remove rock it’s on either. I think I already know the answer to my question, which is just go ahead and trim it down and it will be ok. But any advice would be appreciated or if anyone wants to come over and do a couple cuts for me to watch and I can try it with some one watching me and you could keep anything we cut off.