Forum:Reptilianne ATK Change?

I'm building a reptile deck, and I've been wondering, do Reptilianne cards change their targets original ATK to 0, or do they reduce everything, including equipment/etc? Also, if a monster whose attack has been reduced by a Reptilianne gets equipped with an ATK booster AFTER the fact, does it boost the ATK above 0 or does it stay at 0?