What size should the cutting be?
This is a matter of common sense and personal preference. It is possible to cut a coral clean in half and turn one coral into two. However, we want to promote propagation to provide captive raised specimens. What we mean by this is that the parent is pruned and allowed to re-grow then pruned again rather than hacked into many bits. We would recommend you take a cutting that is at least an inch in length so that it is easy to handle.