Hrm white ghost you say...
That's taller zebra is cool I like the columnar habit!
Maybe it's a hybrid with coarctata or reinwardii!
Sorry I didn't get the pics!
I had great light too darn it!
H, cuspidata?
Love the light comin through the retuse leaf tips!
H. Retusa cv? I forget the cv name, it could be H.mutica but it's doubtful!