
I lifted each coral to near the water surface, but kept them submerged. I turned them upside down so I could work on their hard bases. I used a hacksaw to cut off a fragment near the point of bifurcation near the base. Maybe the hacksaw creates a vibration or a too-sharp back-and-forth motion, that the corals didn’t tolerate.
I’m hoping that a few of the surviving pieces will regrow, and eventually need splitting again.. and when that happens, is there a different tool to use, to break off the hard bifurcating bases into separate fragments?

Excerpt from:
Frogspawn or torch + hacksaw