Doesn't really matter where or how you cut, it'll regrow irrespective of how it's cut. You could even cut the entire head off, slice it into 4 - 6 pieces and you'll end up with a whole colony of pin cushions. Just remember to do the cutting outside of the tank and then rinse everything in a separate bucket of tank water before returning the pieces into the main tank.
too scared of what?
they are very hardy.not as difficult as it sounds.go for it
So just leave it or should I get rid of it ?
Warren, you'll never be happy with it and it'll satart to bug the living daylights out of you in a couple of days time when it still does not want to open, so, you want the address of my Dustbin.....:razz: