I asked this same question last year, didnt get much of a response. I had a 3 yr old 4" clarkii that has been alone since day 1. Last april added another 1" clarkii. The larger female is your standard Clarkii and the new guy was a Galaxy Clarkii. Still to this day they do not share the nems. They get along just fine, occassional chase by the much larger female, but no fin picking and stops immediately after the male does his shake. This is mostly started when the male trys to come cuddle in one of the THREE nems (all the size of softballs), the female will not have any of it, she gets all three nems and the male gets a monti lol. To me they seem paired, but no eggs or anything like that, assuming the male is still becoming an adult as he has not transitioned to full black just yet. But i didn't do anything special, just got the new one and tossed him in, and they got along after a couple weeks is when the fin picking stopped and now the chasing just when he trys to get into the nems.
It is actually pretty funny watching the female hog three nems on side of the tank, and the youger clown will try and sneak around to one of back nems, sometimes lasting a couple seconds, before the female catches him and chases him back to the other side of the tank like they are on a merry go around. Clarkii's are awesome just remember, they're not your typical clowns they will get about the size of deck of cards if not larger so make sure you provide the room they need. My favorite clowns though, get so beautiful as they change colors and start getting the size on them