I had this happen in the past when I had a male and female trimac, but when the lighting would switch over to the blue night mode the male would totally act as if he did not recognize the female around would start to attack her. When normal lights were on the next day acted as if all was normal. I think this was the case with the sevs. The female that was acting aggressive towards the alpha male and was showing a paired interest with the beta male, is now chasing the smaller male and does not want him around her. I think she is slightly larger than him and treats him as a bit inferior. Now Im thinking to take the alpha male and the female and put them into the 65B to try and figure it out with no other fish to stress them out.