Nope, you just need a big enough piece taken out so that you can easily attach it to something.
Just get ready for some nasty chemical warfare because leathers get pissed when they get fragged.
I cut little pieces off and they did fine until they got blown off the rock- dont have a proper frag setup.
Didn't have any nasty chemicals in the water and I think the devil actually curled up a bit more- where as before it was kind of a flat palm with extended fingers. Now it looks better.
Here is a picture of mine before I did anything. I will try and snap a pic of it later
You just take some thread and thread it through part of the coral, then tie it around a rock. The coral will eventually attach to the rock, then you can snip the ends of the thread off.