There are 10 species in the genus Andinoacara (the genus the Green Terror belongs in).
At a young age like yours is, it is difficult to tell them apart, much less gender I.D. them.
The unpaired fins of males are often more pointed.
The blue in the dorsal, in males are often linear, females more smaller spot like.
Here is a male A. coerleopunctatus.
Note the blue streaks the dorsal, and how the dorsal and anal fins come to points, those fins in females can be more rounded.
If you got yours from a LFS it is pretty much assured it is a Green terror, because they are the most common species of the genus available.
A runner up might be A pulcher, the normal colored "blue Acara".