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Hi Jaclyn - I mis-informed you!! The caudel fin is the tail fin. The ventrals are those skinny little fins that dangle below their gills. Currently I've been trying to decide if one of my bettas is a female or a male so I've been studying ventrals. My apologies - I have ventrals on the brain! So to re-cap about the Heart-Tail: Their caudel fin (aka.tail fin) is split, but fused together at the top, right near their body. This is what creates a heart shape. It's obvious and the tail isn't fully split like a true Double-Tail. Hope this helps!