Long, short and in between HM fins.
Yellow = combodian x red - possible genes involved are; blond, non red, red, cambodian
Platinum = metallic opaque white = steel blue background - possible genes involved are; cambodian, steel/royal blue, non red, blond . . . . . plus what ever hidden background.
Possible outcome; cambodian (probably with irids), yellow (probably multi), cellophane - grizzle, white (probably multi or rather grizzled), Irid (multi - red usually fills the fins). Some may be metallic.. . . plus hidden colors such as copper (metallic).
Yellow and white are recessive. You might get something totally different.