The term GT has come to mean almost any Cichlid in the genus Andinoacara these days.
And to me, as juvies most Andinoara species are hard to tell apart, ......and that one in the post looks like a juvie to me.
There are 8 separate species in the genus.
And with that very white substrate, it may be a long time until it shows its true colors.
Add to that, all the inbreeding between pulcher (the blue Acaras) and others in the genus these days, and getting an true ID, other than what the term GT has come to signify may be pie in the sky.

If you don't (or already know) what I keep, could you name this Andinoacara, at this age?.
It is (by the way) a legitimate, species, not a mutt.