that is a Lenticulata Pike Cichlid.It has been in there for months....i originally used it as a dither fish,and i sold it a while back,but the guy i sold it to never picked it up yet. ,,,,,that thing devours feeders....like 7 one at a time.
I was going to guess female as well. Females can get just as beautiful as males and are just as aggressive toward other fish. They just don't get as large..
Nice fish!