sometimes I feel like the only person on this site who can ID american cichlids.
it's a chocolate cichlid. Some are darker some are lighter. It looks exactly like small version of the nice greeen one I used to have. they have that stripe until they hit the 5" mark and then they will have only a single spot.
Hypselecara temporalis
Heres mine around 7" male that has darker colouration
heres an older female I had with light colouiration
thats what you have, not an acara and definately not a nicaraguensis, they ALWAYS have an elongated body, especially when young. plus the fins and face are all wrong