These are sometimes referred to as 'Storm Troopers' (they get their name from their starwars-like helmet), but are a version of 'Fancy White' Ocellaris Clownfish, which are are the offspring of a Standard Ocellaris and a 'Wyoming White' Ocellaris (mostly white).
SA also has their version of 'SA Fancy White' Ocellaris, which are the offspring of a 'SA Fancy' Ocellaris and a 'Wyoming White' Ocellaris.