I have a good idea of what Anthony would recommend--
Set it up in an established tank, even better a monospecific tank NOT plumbed in to other tanks with other recently divided frags that are emitting noxious defensive chemicals...Let it establish itself for 6-8 weeks, then frag it (2 pieces) and return it to the tank it was living in to recover. As long as you make a clean cut with a sharp blade and divide it fairly equally, it's not the cutting that's the dangerous part; it's giving it a chance to recover in a clean tank without a lot of other competing animals.
Chris, if you separated that cube and took out all the RBTA's, then that would be a good place for it.
Good luck!