Quote Originally Posted by DarthEnderX View Post
And I suppose he also doesn't practice Water Breathing either, right?

Pretty sure when he uses ACTUAL Sun Breathing, it's not going to be mistaken for Fire.
Sun Breathing is the core of ALL breath techniques. So if Tanjiro is using any breath technique, but modifying it so it "feels more natural," it is very likely that he's touching on the forgotten techniques.

When Tanjiro uses Water Breathing attacks, but they manifest as fire because he's inserting the family traditional dance moves and they show it switching to red, we can assume that's Sun Breathing.