A rookie joined in a clean filtered tank

I moved two of the bigger ones to smaller tank. They are doing quite well.
I figured out one day why they are getting along. The one was confused if the other was a female. He was sniffing at him at times.
That's the newcomer on the left end I acquired from a far southern Fish Market via delivery service after ordering by phone.
They really love to burrow inside and rest upon a log.
The rookie on the left end loves to climbs on a log.