Yeah yeah, maybe hydnophora is really more of an lps than sps but I'm posting this here. I lost most of a nice hydnophora last summer during an alk crash. A few patches remainined on the skeleton and they survived once I got my parameters back in line. But I wanted to put something else in it's place so I broke it off the rock and am working on growing it back out on a frag rack. However, there are still a few small patches on the rock that didn't come off with the skeleton, I can't remove the rock without some major effort, but I want this off the rock since I'm planning on adding some other frag in it's place. So what's my best option to kill this off without harming other things?