none

I might be able to trim some off in my 10. I have 3 types but the bright green one would be the only one with enought to frag.
 
I just checked and all of mine is attached. Some of it is on a separate small rock and some was just stuck to the substrate.
 
I don't quite understand why you would want some star polyps that are not on a rock or subtrate. Under the right conditions they would cover the rock and then some in no time. What is your plan. Trying to cover an overflow box?
 
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