echeeso, woops. I thought Dragonbreath was green, but only in the anime/3D console games. All the handheld games have a purple/pinkish Dragonbreath.
I think with the new fire shape, a slight movement back to a blue shade would look better. With the popping red and green, you're almost disappointed to not have an accompanying blue. Of course, make your best judgment to see which looks better.