I have a 3" green severum in a 37 gallon tank. I wanted to grow one large fish rather than several small ones. Anyway, I was wondering if this species is normally skiddish?? Everytime I approach the tank, she either hides or turns almost vertical and "sits" on the sand. She is at her best when I feed her. Also, the females have the black spot on the dorsal fin, right?? Thanks!