I think the guy you are referring to is Bronco7777, he is very knowledgable with fiary wrasses.
We have 3 pairs of fairy wrasses (flame, lineatus and labouti) and a pair off six lines, to date I have not witnessed any spawning/mating routines. Also I say pairs but to be honest I am not certain they are male/female. For all pairs I added a large colorful male with a smaller/duller juvenile. I have read that fairy wrasses all start out female and the most dominant/largest becomes the male. All our pairs co-exist and seem to stick together. The two six lines are always within a foot or two of each other and it is a 220 (72x24x30).
The game plan is not to breed them but wanted pairs to watch their interactions etc. If anything ever starts I will let people know out here.