That won't grow back. Hard spines don't grow back. Splits in the soft tissue will, like in the caudal and pectoral fins and splits in the soft parts of the dorsal.
Here's my old male that I rescued from an LFS I worked at. This is a year or so after I saved him.
Here's my old male that I rescued from an LFS I worked at. This is a year or so after I saved him.