Another sexing question. Just picked up a 5 inch GT. My initial thought was male with the trailing find, but the lack of hump has me wondering. It's not close to the biggest or most dominant fish in my 180, perhaps that explains the lack of some dominant traits.
Not all males will develop a hump.
Females can develop fin trailers also.
Mature females can also develop a small head hump.
I think the op's fish is quite difficult to sex for a Gt,however I would guess it's male also.
Some female can develop a small hump and can be quite colorful off breeding. The only sure sign is female will turn dark in breeding dress. GT is hard to sex but I guess it is a male.