Yeah, it might be, I have a smaller one who is definitely yellow. I'm confused on which is male and female. The bigger blue is the most dominate, and the yellow is always getting along with everyone else in the tank. The tank mates I have are, 2 Kenyi (one Blue, one Yellow)... 1 Auratus (the mellowest of the group)... 3 Yellow Labs (mellow, and some times aggressive towards each other)... 1 Red Zebra (believed to be male, gentle).... 1 Jacob peacock (pretty sure a female, it loves the mabunos, I've heard not to mix peacocks)... Surprisingly it's the blue/yellow on top Kenyi who is the bully.