Is it this? http/jjphoto.dk/fish_archive/aquarium/ps...onemus_dayi.htm If you have two males, they may well fight so getting a good number more would help. Sexing them is tricky but males have longer fins and develop more red coloring when in breeding condition. The fish in that photo I posted looks like a female to me but I can't see the fish in your pic clearly enough for an (educated) guess