Atabapo 2 take a long time to get red, and when they become red it is a dark red. They also have ladder pattterns on the body as juveniles, a few red dots on the tail, and a large tear drop.
Juvenile Atabapo 2 aka ladder pike
Adult Atabapo 2
Generally same sex pikes don't like each other as adults. So it might work with one of your other pikes or it won't work with either one.