Males r dark in color and have spots all over and have long pointed dorsal and anal fins females r kinda yellowish with horizontal bars and have more rounded dorsal and anal fins
The spots/coloration seem to change drastically depending on his/her mood. A few minutes before this picture was taken, this fish has dark spots running through the center of it's body (lateral line) right to his/her tail.
If I have to guess, I will tend towards it being a female. However, the lighter coloration might also be due to the "golden sand" substrate.