pom pom xenia

I think I'm finally brave enough to frag my pom pom xenia to spread it out in my tank. I was going to just cut the stalks down as close to the rock as possible and I just have a quick question. Should I cut the xenia inside or outside my tank? Thanks in advance,
Mike
 
I cut em in my tank as well as the wife's anno all the time.. there's a smoky liquid released, but it doesn't seem to hurt anything.
 
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