Cabbage leather (Sinularia dura) is a soft coral, it likes good waterflow, moderate to intense lighting. It is photosynthetic, it will filter feed from the water and is capable of some pretty intense chemical warfare. IMO
, regular waterchanges and regular use of GAC
are important when keeping any leathers, they have pretty noxious terpinoids
As with any leather, they will shed a waxy film regularly, more waterflow during that time will help rid them of the film and re-open more quickly.