Hey Bob;
Is the latin name not Cladiella sp.? (I suck at ID) Is that the same as you seem in my tank? If so, I am sticky to the method of placing another rock beside it (just like you also noted.) Easy, painless and no stress to the mother. I watched mine encrust onto another rock and produce a piece matching the original one within 30 days +/- (3" diameter.)
Unfortunately, star polyp swallowed up the mother.
kari
( a hammer drill is much like a chisel and mallet except less effort )