best thing I've found for wounds & torn fins is
(1) plenty of clean water and
(2) SeaChem Stressguard OR
(3) salt.
google Stressguard's qualities for yourself. it's better than salt, protects tissues while being NON-irritating, but I reserve it for limited circumstances & tank volume. salt is much cheaper. don't combine the two, IMO it would be wasting the cost of Stressguard because salt is mildly irritating.
Once wounded tissue is healing up (not raw), I doubt that Stressguard is much better than salt, if at all.