Kenyi are all light blue base/dark blue bars when small then males turn yellow as they get bigger. I purchased 18 Kenyi hoping to get at least 7 or 8 females and then I'd keep just one of the males. When the males start to turn the change is gradual starting at first with taking on a very slight yellow tinge. Hard to tell from the photo but it looks like yours has a yellow tinge, in which case it is a male and the yellow color will eventually take over.
Most of those are very aggressive. What size tank is it?
Hopefully both of your Kenyi are female since as they reach adulthood multiple males will fight to the point that usually only one survives, unless it is a really large tank. If you have a male but only one female, the male may chase her to death trying to mate with her. Recommended to have at least 5 or more females.
My tank is a 75 gallon aqueon. So far they haven't shown much aggression at all if any towards any of the others. Really there hasn't been many problems. The larger electric blue I have chases the smaller ones around, but it's not to bad. He is really the only aggressive fish I have. The largest fish I have in the tank is a male yellow tail acei. He follows the now identified Kenyi around so I assume they are females.