From 3reef.com member ‘evolved‘ (click link to go to his thread ):

My johnsoni pair spawns several times a week. This has been going on for months now. It happens every evening; the male goes into nuptial display around 9:30. This is at the end of the ramp down of the whites, which shut off at 9:30 and then it’s all blues until they ramp down and off at 10:30. The male will be in nuptial display for up to an hour. While he courts the female every night, she generally complies and does the dance with him, but she isn’t able to produce eggs every day, and never on consecutive days. So some days are just a “dry run” it seems.

However, last night I was finally watching AND recording at the right time. Take a look. You’ll note the rhomboid come over and wait for the feast when the pair start their routine. Then him and the male johnsoni are clearly eating eggs from the water column. I don’t think the male was quite ready for the female here; he usually swims right along side her when she releases, and you see a quick cloud behind them both.