If Thor dont kill them first..... He has already picked off a male. I think there is a sub male hiding as a girl.
Two of them will do the tail slap dance with Thor, the third runs away. That same third one tries to do the tail slap dance with the other two. It always runs from Thor when he gets close, but is trying to look like a girl by barring up the back half of its body like the girls are.
See in picture 2 above, the fish in the background has the bars on the back half of its body. Thor has yet to bar up.
I am feeling bad for the other three. Thor is relentlessly chasing them and dive attacking. All three hide up in the intakes and such when not being chased. I think I may have to keep Thor as a solo male.