Forskahlii's only have red on the bottom half of the tail like H. goliaths. Body & head structure seems to be the easiest way to tell them apart, then again it's only easy if u owned both at the same time. As for the op atf, i also believe its a Brevis or undescribed sub species though im leaning towards brevis. Head structure is a dead give away seeing how its curved down along with its back & where the belly is down towards the tail is flat, that being said only species with that characteristic is H. Brevis. Through first hand experience Fatf & Vatf body structure is almost symmectrical, difference is the fatf body is much more slender.
