Page 318 of Calfo's
Book of Coral Propagation (Second Edition) is on Duncanopsammia axifuga fragmentation. He suggests using a dremel blade to cut the Duncan at the base of the branches. Small Duncans can be scored with the blade and then broken with a flathead screwdriver.
Funny thing. I just bought that book on Amazon 2-3 weeks ago for $39. Now I see that the price is back up to $60. Anyhow, really good and dense book aimed at professional propagators, but with scads of useful info (including many photos of coral fragmentation) and tank construction ideas for that the hobbyist can learn from.
