Usually the male will get breeding stars. When you look at their butts males tend to have an innie and females an outie. To get my fish to spawn I used to keep the tank by the window and do lots of water changes. The water would be a hair warmer and I fed them a high protein diet. I swear everytime there was a full moon they spawned. The male will usually chase the female and the female will look a little rounder because she will be full of eggs. Hope this helps you